Relocation of earthquakes in the Northeast Indian region using joint hypocentre determination method
A set of 1941 earthquake events recorded in the northeast region of India during January 1993 – December 1999 was used for relocation by the Joint Hypocentre Determination (JHD) technique. We have utilized both P- and S-wave arrivals recorded by closely spaced 77 temporary and permanent seismic stat...
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Veröffentlicht in: | Current science (Bangalore) 2005-10, Vol.89 (8), p.1404-1413 |
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description | A set of 1941 earthquake events recorded in the northeast region of India during January 1993 – December 1999 was used for relocation by the Joint Hypocentre Determination (JHD) technique. We have utilized both P- and S-wave arrivals recorded by closely spaced 77 temporary and permanent seismic stations in the region. Results of this analysis show that (a) the average root mean square travel time residual becomes smaller than the corresponding single event locations by the HYP071; (b) station correction varies from -2.43 to 2.32 s for P-wave, and from -2.84 to 2.84 s for S-wave, indicating large crustal velocity variations in the region; (c) positive station corrections are obtained in the Shillong Plateau, Assam valley and in the Manipur fold belt, and negative station corrections are obtained in the Mikir hills, and (d) lateral variation of the velocity structure inferred from station corrections is comparable with that obtained by 3D velocity inversion using the local earthquake tomography method. |
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Results of this analysis show that (a) the average root mean square travel time residual becomes smaller than the corresponding single event locations by the HYP071; (b) station correction varies from -2.43 to 2.32 s for P-wave, and from -2.84 to 2.84 s for S-wave, indicating large crustal velocity variations in the region; (c) positive station corrections are obtained in the Shillong Plateau, Assam valley and in the Manipur fold belt, and negative station corrections are obtained in the Mikir hills, and (d) lateral variation of the velocity structure inferred from station corrections is comparable with that obtained by 3D velocity inversion using the local earthquake tomography method.</description><identifier>ISSN: 0011-3891</identifier><language>eng</language><publisher>Current Science Association</publisher><subject>Earthquakes ; Estimation methods ; Low speed ; Plateaus ; RESEARCH COMMUNICATIONS ; Tectonics ; Tectonophysics ; Tomography ; Travel time ; Zero</subject><ispartof>Current science (Bangalore), 2005-10, Vol.89 (8), p.1404-1413</ispartof><rights>2005 Current Science Association</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/24110847$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/24110847$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>315,782,786,805,58024,58257</link.rule.ids></links><search><creatorcontrib>Bhattacharya, Pankaj Mala</creatorcontrib><creatorcontrib>Pujol, Jose</creatorcontrib><creatorcontrib>Majumdar, R. 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Results of this analysis show that (a) the average root mean square travel time residual becomes smaller than the corresponding single event locations by the HYP071; (b) station correction varies from -2.43 to 2.32 s for P-wave, and from -2.84 to 2.84 s for S-wave, indicating large crustal velocity variations in the region; (c) positive station corrections are obtained in the Shillong Plateau, Assam valley and in the Manipur fold belt, and negative station corrections are obtained in the Mikir hills, and (d) lateral variation of the velocity structure inferred from station corrections is comparable with that obtained by 3D velocity inversion using the local earthquake tomography method.</description><subject>Earthquakes</subject><subject>Estimation methods</subject><subject>Low speed</subject><subject>Plateaus</subject><subject>RESEARCH COMMUNICATIONS</subject><subject>Tectonics</subject><subject>Tectonophysics</subject><subject>Tomography</subject><subject>Travel time</subject><subject>Zero</subject><issn>0011-3891</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><recordid>eNotzM9LwzAYxvEeFJzTP0HIyVvhTZMsyVGGPwZDQfRc0ubtmtomXZIe9t87macHHj58r4oVAKUlU5reFLcpDQAVq0CvCvuJY2hNdsGT0BE0MffHxfxgIs6T3CN5D-cLTcpk560znkQ8_OklOX8gQ3A-k_40hxZ9jkgsZoyT85fkhLkP9q647syY8P5_18X3y_PX9q3cf7zutk_7cqhA5dJqo6TlSqlmA5LZTkuqGiFaBsC5oNhpYRgiZ4JySbltuOyAgRJCacsYWxePl-4cw3HBlOvJpRbH0XgMS6orrShIuTnDhwscUg6xnqObTDzVFacUFJfsF-OBXIA</recordid><startdate>20051025</startdate><enddate>20051025</enddate><creator>Bhattacharya, Pankaj Mala</creator><creator>Pujol, Jose</creator><creator>Majumdar, R. 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R.</creatorcontrib><collection>Earthquake Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Current science (Bangalore)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bhattacharya, Pankaj Mala</au><au>Pujol, Jose</au><au>Majumdar, R. K.</au><au>Kayal, J. R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Relocation of earthquakes in the Northeast Indian region using joint hypocentre determination method</atitle><jtitle>Current science (Bangalore)</jtitle><date>2005-10-25</date><risdate>2005</risdate><volume>89</volume><issue>8</issue><spage>1404</spage><epage>1413</epage><pages>1404-1413</pages><issn>0011-3891</issn><abstract>A set of 1941 earthquake events recorded in the northeast region of India during January 1993 – December 1999 was used for relocation by the Joint Hypocentre Determination (JHD) technique. We have utilized both P- and S-wave arrivals recorded by closely spaced 77 temporary and permanent seismic stations in the region. Results of this analysis show that (a) the average root mean square travel time residual becomes smaller than the corresponding single event locations by the HYP071; (b) station correction varies from -2.43 to 2.32 s for P-wave, and from -2.84 to 2.84 s for S-wave, indicating large crustal velocity variations in the region; (c) positive station corrections are obtained in the Shillong Plateau, Assam valley and in the Manipur fold belt, and negative station corrections are obtained in the Mikir hills, and (d) lateral variation of the velocity structure inferred from station corrections is comparable with that obtained by 3D velocity inversion using the local earthquake tomography method.</abstract><pub>Current Science Association</pub><tpages>10</tpages></addata></record> |
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subjects | Earthquakes Estimation methods Low speed Plateaus RESEARCH COMMUNICATIONS Tectonics Tectonophysics Tomography Travel time Zero |
title | Relocation of earthquakes in the Northeast Indian region using joint hypocentre determination method |
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