九寨溝Ms 7.0級(jí)地震的左旋走滑作用與動(dòng)力機(jī)制
本文選題:青藏高原東緣 切入點(diǎn):九寨溝地震 出處:《成都理工大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年06期
【摘要】:2017年8月8日四川九寨溝發(fā)生的Ms 7.0級(jí)地震是繼2008年汶川Ms 8.0地震、2013年蘆山Ms 7.0級(jí)地震后在青藏高原東緣發(fā)生的又一次強(qiáng)震。本文通過綜合分析九寨溝Ms 7.0級(jí)地震及歷史地震的震源機(jī)制解、余震和歷史地震分布、區(qū)域應(yīng)力場、活動(dòng)斷層等資料,來揭示九寨溝地震的發(fā)震構(gòu)造與動(dòng)力機(jī)制。初步研究結(jié)果表明:(1)此次地震的震中位于塔藏?cái)嗔、岷江斷裂和虎牙斷裂之間的交匯區(qū),顯示活動(dòng)斷裂的交匯區(qū)對(duì)此次地震的發(fā)生具有控制作用;(2)發(fā)震斷裂為虎牙斷裂,斷裂走向?yàn)楸蔽魑飨?傾向南西,傾角較陡,屬于高傾角左旋走滑型地震;(3)震中位于虎牙斷裂北段的北部地震空區(qū),充填了1973年和1976年4次大于Mw6.0級(jí)地震空區(qū);(4)此次地震位于2008年汶川Ms 8.0級(jí)地震的庫侖應(yīng)力增加區(qū),應(yīng)是汶川地震的應(yīng)力傳遞和觸發(fā)的結(jié)果;(5)此次地震位于巴顏喀拉塊體的東北部頂角區(qū),青藏高原東緣下地殼流向北東方向的擠出是驅(qū)動(dòng)此次地震的動(dòng)力機(jī)制。
[Abstract]:The Ms 7.0 earthquake in Jiuzhaigou, Sichuan Province on August 8, 2017 was another strong earthquake on the eastern edge of the Qinghai-Tibet Plateau following the 2008 Wenchuan Ms 8.0 earthquake and the 2013 Lushan Ms 7.0 earthquake.In this paper, the seismogenic structure and dynamic mechanism of Jiuzhaigou earthquake are revealed by synthetically analyzing the focal mechanism solution, aftershock and historical earthquake distribution, regional stress field and active fault of Jiuzhaigou earthquake with Ms 7.0 and historical earthquake.The preliminary results show that the epicenter of the earthquake is located in the intersection area between the Ta-Zang fault, the Minjiang fault and the Hu-ya fault, indicating that the intersection area of the active fault has a controlling effect on the occurrence of the earthquake.) the seismogenic fault is the Hu-ya fault.The fault strike is NW-trending, trending southwestward, and the dip angle is steep, which belongs to the high-dip left-lateral strike-slip earthquake No. 3) the epicenter of which is located in the northern seismic void area of the northern segment of the Hu-ya fault.This earthquake is located in the Coulomb stress increase area of the 2008 Wenchuan Ms 8.0 earthquake.It should be the result of stress transfer and trigger of Wenchuan earthquake. The earthquake is located in the northeast corner of Bayan Kara block. The extrusion of the lower crust in the eastern margin of Qinghai-Xizang Plateau is the dynamic mechanism driving the earthquake.
【作者單位】: 油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實(shí)驗(yàn)室(成都理工大學(xué));四川省蜀通巖土工程公司;四川省地震局;華鎣市地質(zhì)環(huán)境監(jiān)測(cè)站;
【基金】:國家自然科學(xué)基金項(xiàng)目(40841010,40972083,41172162,41372114,41340005) 國土資源部地質(zhì)調(diào)查項(xiàng)目(1212011121268) 油氣藏地質(zhì)及開發(fā)工程國家重點(diǎn)實(shí)驗(yàn)室研究項(xiàng)目(SK-0801)
【分類號(hào)】:P315
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