Seismicity, faulting, and structure of the Koyna-Warna seismic region, Western India from local earthquake tomography and hypocenter locations
Although seismicity near Koyna Reservoir (India) has persisted for ~50 years and includes the largest induced earthquake (M 6.3) reported worldwide, the seismotectonic framework of the area is not well understood. We recorded ~1800 earthquakes from 6 January 2010 to 28 May 2010 and located a subset...
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| Veröffentlicht in: | Journal of geophysical research. Solid earth 2014-08, Vol.119 (8), p.6372-6398 |
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| creator | Dixit, Madan M. Kumar, Sanjay Catchings, R. D. Suman, K. Sarkar, Dipankar Sen, M. K. |
| description | Although seismicity near Koyna Reservoir (India) has persisted for ~50 years and includes the largest induced earthquake (M 6.3) reported worldwide, the seismotectonic framework of the area is not well understood. We recorded ~1800 earthquakes from 6 January 2010 to 28 May 2010 and located a subset of 343 of the highest‐quality earthquakes using the tomoDD code of Zhang and Thurber (2003) to better understand the framework. We also inverted first arrivals for 3‐D Vp, Vs, and Vp/Vs and Poisson's ratio tomography models of the upper 12 km of the crust. Epicenters for the recorded earthquakes are located south of the Koyna River, including a high‐density cluster that coincides with a shallow depth ( |
| doi_str_mv | 10.1002/2014JB010950 |
| format | Article |
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Key Points
Earthquake hypocenters are determined near largest known induced earthquakeImprove the precision of earthquake locations3‐D Vp, Vs, Vp/Vs, and Poisson's ratios suggest fluid‐saturated faults</description><identifier>ISSN: 2169-9313</identifier><identifier>EISSN: 2169-9356</identifier><identifier>DOI: 10.1002/2014JB010950</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>3-D Vp and Vs Models ; earthquake hypocenters ; Earthquakes ; Fault lines ; Fault zones ; Faults ; Fractures ; Geological faults ; Geophysics ; high pore pressure ; India ; induced seismicity ; Poisson's ratio ; Poissons ratio ; Pore pressure ; Reservoirs ; Rivers ; Seismic activity ; Seismic phenomena ; Seismicity ; Three dimensional ; Tomography ; Velocity ; Vp/Vs and Poisson's ratios ; Water depth</subject><ispartof>Journal of geophysical research. Solid earth, 2014-08, Vol.119 (8), p.6372-6398</ispartof><rights>2014. American Geophysical Union. All Rights Reserved.</rights><rights>Copyright Blackwell Publishing Ltd. Aug 2014</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4671-60771bc914b7fe399bf941f74283310499705e3aedd5ab275a831b16e7d35c273</citedby><cites>FETCH-LOGICAL-a4671-60771bc914b7fe399bf941f74283310499705e3aedd5ab275a831b16e7d35c273</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2014JB010950$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2014JB010950$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,27924,27925,45574,45575,46409,46833</link.rule.ids></links><search><creatorcontrib>Dixit, Madan M.</creatorcontrib><creatorcontrib>Kumar, Sanjay</creatorcontrib><creatorcontrib>Catchings, R. D.</creatorcontrib><creatorcontrib>Suman, K.</creatorcontrib><creatorcontrib>Sarkar, Dipankar</creatorcontrib><creatorcontrib>Sen, M. K.</creatorcontrib><title>Seismicity, faulting, and structure of the Koyna-Warna seismic region, Western India from local earthquake tomography and hypocenter locations</title><title>Journal of geophysical research. Solid earth</title><addtitle>J. Geophys. Res. Solid Earth</addtitle><description>Although seismicity near Koyna Reservoir (India) has persisted for ~50 years and includes the largest induced earthquake (M 6.3) reported worldwide, the seismotectonic framework of the area is not well understood. We recorded ~1800 earthquakes from 6 January 2010 to 28 May 2010 and located a subset of 343 of the highest‐quality earthquakes using the tomoDD code of Zhang and Thurber (2003) to better understand the framework. We also inverted first arrivals for 3‐D Vp, Vs, and Vp/Vs and Poisson's ratio tomography models of the upper 12 km of the crust. Epicenters for the recorded earthquakes are located south of the Koyna River, including a high‐density cluster that coincides with a shallow depth (<1.5 km) zone of relatively high Vp and low Vs (also high Vp/Vs and Poisson's ratios) near Warna Reservoir. This anomalous zone, which extends near vertically to at least 8 km depth and laterally northward at least 15 km, is likely a water‐saturated zone of faults under high pore pressures. Because many of the earthquakes occur on the periphery of the fault zone, rather than near its center, the observed seismicity‐velocity correlations are consistent with the concept that many of the earthquakes nucleate in fractures adjacent to the main fault zone due to high pore pressure. We interpret our velocity images as showing a series of northwest trending faults locally near the central part of Warna Reservoir and a major northward trending fault zone north of Warna Reservoir.
Key Points
Earthquake hypocenters are determined near largest known induced earthquakeImprove the precision of earthquake locations3‐D Vp, Vs, Vp/Vs, and Poisson's ratios suggest fluid‐saturated faults</description><subject>3-D Vp and Vs Models</subject><subject>earthquake hypocenters</subject><subject>Earthquakes</subject><subject>Fault lines</subject><subject>Fault zones</subject><subject>Faults</subject><subject>Fractures</subject><subject>Geological faults</subject><subject>Geophysics</subject><subject>high pore pressure</subject><subject>India</subject><subject>induced seismicity</subject><subject>Poisson's ratio</subject><subject>Poissons ratio</subject><subject>Pore pressure</subject><subject>Reservoirs</subject><subject>Rivers</subject><subject>Seismic activity</subject><subject>Seismic phenomena</subject><subject>Seismicity</subject><subject>Three dimensional</subject><subject>Tomography</subject><subject>Velocity</subject><subject>Vp/Vs and Poisson's ratios</subject><subject>Water depth</subject><issn>2169-9313</issn><issn>2169-9356</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNp9kU1vFCEchydGE5vamx-AxIuHHeUPAyxHd23XbhtNfMl6I8wMs0s7A1tgovMl_MxixzTGQ7lAyPP8ePkVxUvAbwBj8pZgqLYrDFgy_KQ4IcBlKSnjTx_WQJ8XZzHe4DyWeQuqk-LXF2PjYBubpgXq9Ngn6_YLpF2LYgpjk8ZgkO9QOhh05Seny50OTqM4ayiYvfVugXYmJhMcunSt1agLfkC9b3SPjA7pcDfqW4OSH_w-6ONhus8_TEffGJe1ezTlnPiieNbpPpqzv_Np8e3i_Ov6Q3n9aXO5fndd6ooLKDkWAuomv6AWnaFS1p2soBMVWVIKuJJSYGaoNm3LdE0E00sKNXAjWsoaIuhp8XrOPQZ_N-a7q8HGxvS9dsaPUQEnGFPJOcnoq__QGz_mL-ijIpRICflk9hgFvGIVyCXhmVrMVBN8jMF06hjsoMOkAKs_Lap_W8w4nfEftjfTo6zabj6vGBYcslXOls2V_HywdLhVXFDB1O7jRr2vdherq-9btaa_AaHkrHQ</recordid><startdate>201408</startdate><enddate>201408</enddate><creator>Dixit, Madan M.</creator><creator>Kumar, Sanjay</creator><creator>Catchings, R. D.</creator><creator>Suman, K.</creator><creator>Sarkar, Dipankar</creator><creator>Sen, M. K.</creator><general>Blackwell Publishing Ltd</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7TG</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>SOI</scope></search><sort><creationdate>201408</creationdate><title>Seismicity, faulting, and structure of the Koyna-Warna seismic region, Western India from local earthquake tomography and hypocenter locations</title><author>Dixit, Madan M. ; Kumar, Sanjay ; Catchings, R. D. ; Suman, K. ; Sarkar, Dipankar ; Sen, M. K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a4671-60771bc914b7fe399bf941f74283310499705e3aedd5ab275a831b16e7d35c273</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>3-D Vp and Vs Models</topic><topic>earthquake hypocenters</topic><topic>Earthquakes</topic><topic>Fault lines</topic><topic>Fault zones</topic><topic>Faults</topic><topic>Fractures</topic><topic>Geological faults</topic><topic>Geophysics</topic><topic>high pore pressure</topic><topic>India</topic><topic>induced seismicity</topic><topic>Poisson's ratio</topic><topic>Poissons ratio</topic><topic>Pore pressure</topic><topic>Reservoirs</topic><topic>Rivers</topic><topic>Seismic activity</topic><topic>Seismic phenomena</topic><topic>Seismicity</topic><topic>Three dimensional</topic><topic>Tomography</topic><topic>Velocity</topic><topic>Vp/Vs and Poisson's ratios</topic><topic>Water depth</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dixit, Madan M.</creatorcontrib><creatorcontrib>Kumar, Sanjay</creatorcontrib><creatorcontrib>Catchings, R. 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Solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dixit, Madan M.</au><au>Kumar, Sanjay</au><au>Catchings, R. D.</au><au>Suman, K.</au><au>Sarkar, Dipankar</au><au>Sen, M. K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Seismicity, faulting, and structure of the Koyna-Warna seismic region, Western India from local earthquake tomography and hypocenter locations</atitle><jtitle>Journal of geophysical research. Solid earth</jtitle><addtitle>J. Geophys. Res. Solid Earth</addtitle><date>2014-08</date><risdate>2014</risdate><volume>119</volume><issue>8</issue><spage>6372</spage><epage>6398</epage><pages>6372-6398</pages><issn>2169-9313</issn><eissn>2169-9356</eissn><abstract>Although seismicity near Koyna Reservoir (India) has persisted for ~50 years and includes the largest induced earthquake (M 6.3) reported worldwide, the seismotectonic framework of the area is not well understood. We recorded ~1800 earthquakes from 6 January 2010 to 28 May 2010 and located a subset of 343 of the highest‐quality earthquakes using the tomoDD code of Zhang and Thurber (2003) to better understand the framework. We also inverted first arrivals for 3‐D Vp, Vs, and Vp/Vs and Poisson's ratio tomography models of the upper 12 km of the crust. Epicenters for the recorded earthquakes are located south of the Koyna River, including a high‐density cluster that coincides with a shallow depth (<1.5 km) zone of relatively high Vp and low Vs (also high Vp/Vs and Poisson's ratios) near Warna Reservoir. This anomalous zone, which extends near vertically to at least 8 km depth and laterally northward at least 15 km, is likely a water‐saturated zone of faults under high pore pressures. Because many of the earthquakes occur on the periphery of the fault zone, rather than near its center, the observed seismicity‐velocity correlations are consistent with the concept that many of the earthquakes nucleate in fractures adjacent to the main fault zone due to high pore pressure. We interpret our velocity images as showing a series of northwest trending faults locally near the central part of Warna Reservoir and a major northward trending fault zone north of Warna Reservoir.
Key Points
Earthquake hypocenters are determined near largest known induced earthquakeImprove the precision of earthquake locations3‐D Vp, Vs, Vp/Vs, and Poisson's ratios suggest fluid‐saturated faults</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2014JB010950</doi><tpages>27</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of geophysical research. Solid earth, 2014-08, Vol.119 (8), p.6372-6398 |
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| subjects | 3-D Vp and Vs Models earthquake hypocenters Earthquakes Fault lines Fault zones Faults Fractures Geological faults Geophysics high pore pressure India induced seismicity Poisson's ratio Poissons ratio Pore pressure Reservoirs Rivers Seismic activity Seismic phenomena Seismicity Three dimensional Tomography Velocity Vp/Vs and Poisson's ratios Water depth |
| title | Seismicity, faulting, and structure of the Koyna-Warna seismic region, Western India from local earthquake tomography and hypocenter locations |
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