Seismogenic Structure of the April 20, 2013, Lushan Ms7 Earthquake in Sichuan
At 08：02 on April 20, 2013, a Ms7.0 earthquake occurred in Lushan, Ya＇an, in the Longmenshan fault zone, Sichuan. The epicenter was located between Taiping Town and Shuangshi Town, Lushan County and the maximum earthquake intensity at the epicenter reached class IX. Field investigations in the epice...
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| Veröffentlicht in: | Acta geologica Sinica (Beijing) 2013-06, Vol.87 (3), p.633-645 |
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| creator | Yueqiao, ZHANG Shuwen, DONG Chuntang, HOU Jusong, SHI Zhonghai, WU Hailong, LI Ping, SUN Gang, LIU Jian, LI |
| description | At 08：02 on April 20, 2013, a Ms7.0 earthquake occurred in Lushan, Ya＇an, in the Longmenshan fault zone, Sichuan. The epicenter was located between Taiping Town and Shuangshi Town, Lushan County and the maximum earthquake intensity at the epicenter reached class IX. Field investigations in the epicenter area found that, although buildings were seriously damaged, no obvious surface rupture structure was produced, only some ground fissures and sand blows and water ejection phenomena being seen. An integrated analysis of high-resolution remote sensing image interpretation, mainshock and aftershock distribution, and focal mechanism solutions indicated that this earthquake was an independent rupturing event in the southwestern segment of the Longmenshan fault zone, belonging to the thrust-type earthquake. Ruptures occurred along the south-central segment of the Shuangshi-Dachuan fault and the principal rupture plane dipped SW at 33-43% It is inferred that the Lushan earthquake might be related to the ramp activity of the basal detachment zone （13-19 kin） of the Longmenshan fault zone. Historically, there occurred at least two Ms6-6.5 earthquakes along the Shuangshi-Dachuan fault zone; thus it is thought that the Lushan earthquake, different from the Wenchuan earthquake, was a characteristic one in the southwestern segment of the Longmenshan fault zone. In-situ stress measurements indicated the Lushan earthquake was the result of stress release of the southwestern segment of the Longmenshan fault zone after the Wenchuan earthquake. This paper analyzes the tectonic setting of the seismogenic structure of this earthquake. |
| doi_str_mv | 10.1111/1755-6724.12075 |
| format | Article |
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The epicenter was located between Taiping Town and Shuangshi Town, Lushan County and the maximum earthquake intensity at the epicenter reached class IX. Field investigations in the epicenter area found that, although buildings were seriously damaged, no obvious surface rupture structure was produced, only some ground fissures and sand blows and water ejection phenomena being seen. An integrated analysis of high-resolution remote sensing image interpretation, mainshock and aftershock distribution, and focal mechanism solutions indicated that this earthquake was an independent rupturing event in the southwestern segment of the Longmenshan fault zone, belonging to the thrust-type earthquake. Ruptures occurred along the south-central segment of the Shuangshi-Dachuan fault and the principal rupture plane dipped SW at 33-43% It is inferred that the Lushan earthquake might be related to the ramp activity of the basal detachment zone （13-19 kin） of the Longmenshan fault zone. Historically, there occurred at least two Ms6-6.5 earthquakes along the Shuangshi-Dachuan fault zone; thus it is thought that the Lushan earthquake, different from the Wenchuan earthquake, was a characteristic one in the southwestern segment of the Longmenshan fault zone. In-situ stress measurements indicated the Lushan earthquake was the result of stress release of the southwestern segment of the Longmenshan fault zone after the Wenchuan earthquake. This paper analyzes the tectonic setting of the seismogenic structure of this earthquake.</description><edition>English ed.</edition><identifier>ISSN: 1000-9515</identifier><identifier>EISSN: 1755-6724</identifier><identifier>DOI: 10.1111/1755-6724.12075</identifier><language>eng</language><publisher>Oxford, UK: Blackwell Publishing Ltd</publisher><subject>Earthquake construction ; Earthquake damage ; Faults ; ground fissure ; Longmenshan fault zone ; Lushan ; Rupture ; Sand ; Segments ; Seismic phenomena ; Shuangshi-Dachuan fault ; Sichuan ; thrust ramp ; Towns ; 发震构造 ; 四川 ; 地表破裂 ; 地震发生 ; 大地震 ; 庐山 ; 遥感图像解译 ; 龙门山断裂带</subject><ispartof>Acta geologica Sinica (Beijing), 2013-06, Vol.87 (3), p.633-645</ispartof><rights>2013 Geological Society of China</rights><rights>Copyright © Wanfang Data Co. Ltd. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a5015-18c75963a730f7380f13bbbe9537a038c7143ed8da245ad4d57323e7a3e69323</citedby><cites>FETCH-LOGICAL-a5015-18c75963a730f7380f13bbbe9537a038c7143ed8da245ad4d57323e7a3e69323</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttp://image.cqvip.com/vip1000/qk/86253X/86253X.jpg</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2F1755-6724.12075$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2F1755-6724.12075$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Yueqiao, ZHANG</creatorcontrib><creatorcontrib>Shuwen, DONG</creatorcontrib><creatorcontrib>Chuntang, HOU</creatorcontrib><creatorcontrib>Jusong, SHI</creatorcontrib><creatorcontrib>Zhonghai, WU</creatorcontrib><creatorcontrib>Hailong, LI</creatorcontrib><creatorcontrib>Ping, SUN</creatorcontrib><creatorcontrib>Gang, LIU</creatorcontrib><creatorcontrib>Jian, LI</creatorcontrib><title>Seismogenic Structure of the April 20, 2013, Lushan Ms7 Earthquake in Sichuan</title><title>Acta geologica Sinica (Beijing)</title><addtitle>Acta Geologica Sinica</addtitle><description>At 08：02 on April 20, 2013, a Ms7.0 earthquake occurred in Lushan, Ya＇an, in the Longmenshan fault zone, Sichuan. The epicenter was located between Taiping Town and Shuangshi Town, Lushan County and the maximum earthquake intensity at the epicenter reached class IX. Field investigations in the epicenter area found that, although buildings were seriously damaged, no obvious surface rupture structure was produced, only some ground fissures and sand blows and water ejection phenomena being seen. An integrated analysis of high-resolution remote sensing image interpretation, mainshock and aftershock distribution, and focal mechanism solutions indicated that this earthquake was an independent rupturing event in the southwestern segment of the Longmenshan fault zone, belonging to the thrust-type earthquake. Ruptures occurred along the south-central segment of the Shuangshi-Dachuan fault and the principal rupture plane dipped SW at 33-43% It is inferred that the Lushan earthquake might be related to the ramp activity of the basal detachment zone （13-19 kin） of the Longmenshan fault zone. Historically, there occurred at least two Ms6-6.5 earthquakes along the Shuangshi-Dachuan fault zone; thus it is thought that the Lushan earthquake, different from the Wenchuan earthquake, was a characteristic one in the southwestern segment of the Longmenshan fault zone. In-situ stress measurements indicated the Lushan earthquake was the result of stress release of the southwestern segment of the Longmenshan fault zone after the Wenchuan earthquake. This paper analyzes the tectonic setting of the seismogenic structure of this earthquake.</description><subject>Earthquake construction</subject><subject>Earthquake damage</subject><subject>Faults</subject><subject>ground fissure</subject><subject>Longmenshan fault zone</subject><subject>Lushan</subject><subject>Rupture</subject><subject>Sand</subject><subject>Segments</subject><subject>Seismic phenomena</subject><subject>Shuangshi-Dachuan fault</subject><subject>Sichuan</subject><subject>thrust ramp</subject><subject>Towns</subject><subject>发震构造</subject><subject>四川</subject><subject>地表破裂</subject><subject>地震发生</subject><subject>大地震</subject><subject>庐山</subject><subject>遥感图像解译</subject><subject>龙门山断裂带</subject><issn>1000-9515</issn><issn>1755-6724</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqFkcFP2zAUxq1pk8bKzrsacWAHAs9xHCfHUkFBKpu0oiFxsdzEaQypQ-1EA_56XmjpYRcs2X6yf5_f8_sI-cHghOE4ZVKIKJVxcsJikOIT2dudfMYYAKJcMPGVfAvhHiAVKRN75HpubFi1S-NsQeed74uu94a2Fe1qQ8eP3jY0hmOcjB_TWR9q7eh1kPRc-65e9_rBUOvo3BZ1r90--VLpJpjv231Ebi7ObyaX0ez39GoynkVaABMRywop8pRryaGSPIOK8cViYXLBpQaOtyzhpsxKHSdCl0kpJI-5kZqbNMdoRI42z_7TrtJuqe7b3jtMqMqXp4UyQ7HAAdcR-bkhH3277k3o1MqGwjSNdqbtg2ISGLA0x3wfognPpciwnYge_ofuCmAJQJzFIhuo0w1V-DYEbyqF3Vxp_6wYqMEyNRikBoPUm2WoSLf_so15_ghX48l0_i6MNkIbOvO0E2r_gDxH9PbXFOfZ7V3256-6QP5gW1rduuXaYgvfNUkaZ1LKnL8CAV-tLg</recordid><startdate>201306</startdate><enddate>201306</enddate><creator>Yueqiao, ZHANG</creator><creator>Shuwen, DONG</creator><creator>Chuntang, HOU</creator><creator>Jusong, SHI</creator><creator>Zhonghai, WU</creator><creator>Hailong, LI</creator><creator>Ping, SUN</creator><creator>Gang, LIU</creator><creator>Jian, LI</creator><general>Blackwell Publishing Ltd</general><general>Wiley Subscription Services, Inc</general><general>Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081%Chinese Academy of Geological Sciences,Beijing,100037</general><scope>2RA</scope><scope>92L</scope><scope>CQIGP</scope><scope>W94</scope><scope>~WA</scope><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H96</scope><scope>KR7</scope><scope>L.G</scope><scope>7SM</scope><scope>2B.</scope><scope>4A8</scope><scope>92I</scope><scope>93N</scope><scope>PSX</scope><scope>TCJ</scope></search><sort><creationdate>201306</creationdate><title>Seismogenic Structure of the April 20, 2013, Lushan Ms7 Earthquake in Sichuan</title><author>Yueqiao, ZHANG ; 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The epicenter was located between Taiping Town and Shuangshi Town, Lushan County and the maximum earthquake intensity at the epicenter reached class IX. Field investigations in the epicenter area found that, although buildings were seriously damaged, no obvious surface rupture structure was produced, only some ground fissures and sand blows and water ejection phenomena being seen. An integrated analysis of high-resolution remote sensing image interpretation, mainshock and aftershock distribution, and focal mechanism solutions indicated that this earthquake was an independent rupturing event in the southwestern segment of the Longmenshan fault zone, belonging to the thrust-type earthquake. Ruptures occurred along the south-central segment of the Shuangshi-Dachuan fault and the principal rupture plane dipped SW at 33-43% It is inferred that the Lushan earthquake might be related to the ramp activity of the basal detachment zone （13-19 kin） of the Longmenshan fault zone. Historically, there occurred at least two Ms6-6.5 earthquakes along the Shuangshi-Dachuan fault zone; thus it is thought that the Lushan earthquake, different from the Wenchuan earthquake, was a characteristic one in the southwestern segment of the Longmenshan fault zone. In-situ stress measurements indicated the Lushan earthquake was the result of stress release of the southwestern segment of the Longmenshan fault zone after the Wenchuan earthquake. This paper analyzes the tectonic setting of the seismogenic structure of this earthquake.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/1755-6724.12075</doi><tpages>13</tpages><edition>English ed.</edition></addata></record> |
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| ispartof | Acta geologica Sinica (Beijing), 2013-06, Vol.87 (3), p.633-645 |
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| source | Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | Earthquake construction Earthquake damage Faults ground fissure Longmenshan fault zone Lushan Rupture Sand Segments Seismic phenomena Shuangshi-Dachuan fault Sichuan thrust ramp Towns 发震构造 四川 地表破裂 地震发生 大地震 庐山 遥感图像解译 龙门山断裂带 |
| title | Seismogenic Structure of the April 20, 2013, Lushan Ms7 Earthquake in Sichuan |
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