Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California
Abstract We propose a time‐evolving approach to conduct traveltime seismic tomography in the 1989 Mw 6.9 Loma Prieta earthquake and 2014 Mw 6.0 South Napa earthquake area, California. The recording period of the chosen seismic data between 1 January 1967 and the day before the 2014 South Napa earthq...
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| Format: | Article |
| Language: | English |
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Wiley
2017-04-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2017GL072785 |
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| author | Ping Tong Dinghui Yang Dongzhuo Li Qinya Liu |
| author_facet | Ping Tong Dinghui Yang Dongzhuo Li Qinya Liu |
| author_sort | Ping Tong |
| collection | DOAJ |
| description | Abstract We propose a time‐evolving approach to conduct traveltime seismic tomography in the 1989 Mw 6.9 Loma Prieta earthquake and 2014 Mw 6.0 South Napa earthquake area, California. The recording period of the chosen seismic data between 1 January 1967 and the day before the 2014 South Napa earthquake is divided into two time windows, separated by the 1989 Loma Prieta earthquake. In each time window the subsurface velocity structure is iteratively updated. Starting from the final model of the first time window, the velocity model has been successively improved throughout iterations in the second time window, indicating that the traveltime data of later time windows have provided extra information to refine the subsurface images. Strong heterogeneities are observed in the final P wave velocity model. Both of the two large earthquakes occurred at transition zones in between high VP and low VP anomalies. In all, this study shows the effectiveness of the time‐evolving seismic tomography method. |
| format | Article |
| id | doaj-art-0e3da9c68a834e4dafc3143fa54deb1c |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2017-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-0e3da9c68a834e4dafc3143fa54deb1c2025-08-20T01:51:46ZengWileyGeophysical Research Letters0094-82761944-80072017-04-014473165317510.1002/2017GL072785Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, CaliforniaPing Tong0Dinghui Yang1Dongzhuo Li2Qinya Liu3Division of Mathematical Sciences, School of Physical and Mathematical Sciences and Asian School of the Environment Nanyang Technological University SingaporeDepartment of Mathematical Sciences Tsinghua University Beijing ChinaDepartment of Geophysics Stanford University Stanford California USADepartment of Physics and Department of Earth Sciences University of Toronto Toronto Ontario CanadaAbstract We propose a time‐evolving approach to conduct traveltime seismic tomography in the 1989 Mw 6.9 Loma Prieta earthquake and 2014 Mw 6.0 South Napa earthquake area, California. The recording period of the chosen seismic data between 1 January 1967 and the day before the 2014 South Napa earthquake is divided into two time windows, separated by the 1989 Loma Prieta earthquake. In each time window the subsurface velocity structure is iteratively updated. Starting from the final model of the first time window, the velocity model has been successively improved throughout iterations in the second time window, indicating that the traveltime data of later time windows have provided extra information to refine the subsurface images. Strong heterogeneities are observed in the final P wave velocity model. Both of the two large earthquakes occurred at transition zones in between high VP and low VP anomalies. In all, this study shows the effectiveness of the time‐evolving seismic tomography method.https://doi.org/10.1002/2017GL072785seismic tomography |
| spellingShingle | Ping Tong Dinghui Yang Dongzhuo Li Qinya Liu Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California Geophysical Research Letters seismic tomography |
| title | Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California |
| title_full | Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California |
| title_fullStr | Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California |
| title_full_unstemmed | Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California |
| title_short | Time‐evolving seismic tomography: The method and its application to the 1989 Loma Prieta and 2014 South Napa earthquake area, California |
| title_sort | time evolving seismic tomography the method and its application to the 1989 loma prieta and 2014 south napa earthquake area california |
| topic | seismic tomography |
| url | https://doi.org/10.1002/2017GL072785 |
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