Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy

Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the r...
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Autor*in:	Mao, W. J. [verfasserIn] Suhadolc, P.

Format:	Artikel
Sprache:	Englisch

Erschienen:	1992

Anmerkung:	© Birkhäuser Verlag 1992

Übergeordnetes Werk:	Enthalten in: Pure and applied geophysics - Birkhäuser-Verlag, 1964, 138(1992), 2 vom: Juni, Seite 267-285
Übergeordnetes Werk:	volume:138 ; year:1992 ; number:2 ; month:06 ; pages:267-285

Links:	Volltext

DOI / URN:	10.1007/BF00878899

Katalog-ID:	OLC2069471845

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520			\|a Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth.
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allfields	10.1007/BF00878899 doi (DE-627)OLC2069471845 (DE-He213)BF00878899-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Mao, W. J. verfasserin aut Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy 1992 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Birkhäuser Verlag 1992 Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. Suhadolc, P. aut Enthalten in Pure and applied geophysics Birkhäuser-Verlag, 1964 138(1992), 2 vom: Juni, Seite 267-285 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:138 year:1992 number:2 month:06 pages:267-285 https://doi.org/10.1007/BF00878899 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4029 GBV_ILN_4046 GBV_ILN_4103 GBV_ILN_4323 AR 138 1992 2 06 267-285
spelling	10.1007/BF00878899 doi (DE-627)OLC2069471845 (DE-He213)BF00878899-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Mao, W. J. verfasserin aut Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy 1992 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Birkhäuser Verlag 1992 Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. Suhadolc, P. aut Enthalten in Pure and applied geophysics Birkhäuser-Verlag, 1964 138(1992), 2 vom: Juni, Seite 267-285 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:138 year:1992 number:2 month:06 pages:267-285 https://doi.org/10.1007/BF00878899 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4029 GBV_ILN_4046 GBV_ILN_4103 GBV_ILN_4323 AR 138 1992 2 06 267-285
allfields_unstemmed	10.1007/BF00878899 doi (DE-627)OLC2069471845 (DE-He213)BF00878899-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Mao, W. J. verfasserin aut Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy 1992 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Birkhäuser Verlag 1992 Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. Suhadolc, P. aut Enthalten in Pure and applied geophysics Birkhäuser-Verlag, 1964 138(1992), 2 vom: Juni, Seite 267-285 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:138 year:1992 number:2 month:06 pages:267-285 https://doi.org/10.1007/BF00878899 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4029 GBV_ILN_4046 GBV_ILN_4103 GBV_ILN_4323 AR 138 1992 2 06 267-285
allfieldsGer	10.1007/BF00878899 doi (DE-627)OLC2069471845 (DE-He213)BF00878899-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Mao, W. J. verfasserin aut Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy 1992 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Birkhäuser Verlag 1992 Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. Suhadolc, P. aut Enthalten in Pure and applied geophysics Birkhäuser-Verlag, 1964 138(1992), 2 vom: Juni, Seite 267-285 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:138 year:1992 number:2 month:06 pages:267-285 https://doi.org/10.1007/BF00878899 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4029 GBV_ILN_4046 GBV_ILN_4103 GBV_ILN_4323 AR 138 1992 2 06 267-285
allfieldsSound	10.1007/BF00878899 doi (DE-627)OLC2069471845 (DE-He213)BF00878899-p DE-627 ger DE-627 rakwb eng 550 VZ 550 VZ 16,13 ssgn Mao, W. J. verfasserin aut Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy 1992 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Birkhäuser Verlag 1992 Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. Suhadolc, P. aut Enthalten in Pure and applied geophysics Birkhäuser-Verlag, 1964 138(1992), 2 vom: Juni, Seite 267-285 (DE-627)129538353 (DE-600)216719-0 (DE-576)014971038 0033-4553 nnns volume:138 year:1992 number:2 month:06 pages:267-285 https://doi.org/10.1007/BF00878899 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO GBV_ILN_11 GBV_ILN_20 GBV_ILN_21 GBV_ILN_22 GBV_ILN_30 GBV_ILN_31 GBV_ILN_40 GBV_ILN_47 GBV_ILN_70 GBV_ILN_267 GBV_ILN_601 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2027 GBV_ILN_4012 GBV_ILN_4028 GBV_ILN_4029 GBV_ILN_4046 GBV_ILN_4103 GBV_ILN_4323 AR 138 1992 2 06 267-285
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source	Enthalten in Pure and applied geophysics 138(1992), 2 vom: Juni, Seite 267-285 volume:138 year:1992 number:2 month:06 pages:267-285
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J.</subfield><subfield code="e">verfasserin</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="c">1992</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">ohne Hilfsmittel zu benutzen</subfield><subfield code="b">n</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Band</subfield><subfield code="b">nc</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="500" ind1=" " ind2=" "><subfield code="a">© Birkhäuser Verlag 1992</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). 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author	Mao, W. J.
spellingShingle	Mao, W. J. ddc 550 ssgn 16,13 Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy
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topic_title	550 VZ 16,13 ssgn Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy
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title	Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy
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title_full	Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy
author_sort	Mao, W. J.
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author_browse	Mao, W. J. Suhadolc, P.
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doi_str_mv	10.1007/BF00878899
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title_sort	simultaneous inversion of velocity structures and hypocentral locations: application to the friuli seismic area ne italy
title_auth	Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy
abstract	Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. © Birkhäuser Verlag 1992
abstractGer	Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. © Birkhäuser Verlag 1992
abstract_unstemmed	Abstract A layeredP- andS-wave velocity model is obtained for the Friuli seismic area using the arrival time data ofP- andS-waves from local earthquakes. A damped least-squares method is applied in the inversion. The data used are 994P-wave arrival times for 177 events which have epicenters in the region covered by the Friuli seismic network operated by Osservatorio Geofisico sperimentale (OGS) di Trieste, which are jointly inverted for the earthquake hypocenters andP-wave velocity model. TheS-wave velocity model is estimated on the basis of 978S-wave arrival times and the hypocenters obtained from theP-wave arrival time inversion. We also applied an approach thatP- andS-wave arrival time data are jointly used in the inversion (Roecker, 1982). The results show thatS-wave velocity structures obtained from the two methods are quite consistent, butP-wave velocity structures have obvious differences. This is apparent becauseP-waves are more sensitive to the hypocentral location thanS-waves, and the reading errors ofS-wave arrival times, which are much larger than those ofP-waves, bring large location errors in the joint inversion ofP- andS-wave arrival time. The synthetic data tests indicated that when the reading errors ofS-wave arrivals are larger than four times that ofP-wave arrivals, the method proposed in this paper seems more valid thanP- andS-wave data joint inversion. Most of the relocated events occurred in the depth range between 7 and 11 km, just above the biggest jump in velocity. This jump might be related to the detachment line hypothesized byCarulli et al. (1982). From the invertedP- andS-wave velocities, we obtain an average value 1.82 forVp/Vs in the first 16 km depth. © Birkhäuser Verlag 1992
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title_short	Simultaneous inversion of velocity structures and hypocentral locations: Application to the Friuli seismic area NE Italy
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