本文選題：門(mén)源地震　切入點(diǎn)：冷龍嶺斷裂帶　出處：《地震地質(zhì)》2017年03期 　論文類(lèi)型：期刊論文

【摘要】：青海門(mén)源北部的冷龍嶺斷裂帶于2016年發(fā)生M_S6.4地震,該地震與1986年發(fā)生的另一次M_S6.4地震的震源機(jī)制解截然不同,并且二者與冷龍嶺主斷層幾乎表現(xiàn)為純左旋走滑的性質(zhì)也差異很大。為明確2次地震的發(fā)震構(gòu)造特征,分析二者與冷龍嶺主斷層的關(guān)系,利用Sentinel-1A數(shù)據(jù)干涉處理得到了2016年地震的同震形變場(chǎng),并結(jié)合高分辨率影像、余震精定位及GPS資料對(duì)斷層構(gòu)造樣式及地震構(gòu)造特征進(jìn)行了研究。研究結(jié)果表明,2016年地震發(fā)生在冷龍嶺斷裂帶西段北側(cè)的分支斷層上,地震造成分支斷層兩側(cè)發(fā)生背斜式褶曲隆升。2次地震分別發(fā)生在分支斷層的東西兩端,其兩端分別向冷龍嶺主斷層彎曲收斂并交會(huì),在平面上形成左行右階與左行左階的幾何結(jié)構(gòu),在區(qū)域整體剪切環(huán)境下,分別發(fā)生剪切擠壓與剪切拉張,因而造成2次地震的震源機(jī)制解分別表現(xiàn)為壓性與張性為主又兼具一定的走滑性質(zhì),綜合認(rèn)為分支斷層與主斷層之間的構(gòu)造組合樣式是導(dǎo)致2個(gè)不同震源機(jī)制解的主要因素。2次地震活動(dòng)皆反映了冷龍嶺斷裂帶整體表現(xiàn)為左旋走滑運(yùn)動(dòng)特征,該構(gòu)造變形機(jī)制也體現(xiàn)了祁連-海原構(gòu)造帶對(duì)青藏高原東北緣的構(gòu)造調(diào)節(jié)作用,即來(lái)自于青藏板塊的構(gòu)造運(yùn)動(dòng)在受到北部戈壁-阿拉善塊體及東部華北克拉通塊體的阻擋后,在青藏高原東北緣通過(guò)一系列左旋走滑斷裂的調(diào)節(jié),構(gòu)造運(yùn)動(dòng)方向逐漸發(fā)生順時(shí)針旋轉(zhuǎn)。門(mén)源地震使得對(duì)冷龍嶺斷裂帶地震地質(zhì)問(wèn)題的深入研究更加緊迫。
[Abstract]:The MS6.4 earthquake occurred in the Lenglongling fault zone in the northern part of Mengyuan, Qinghai on 2016. The earthquake is quite different from the focal mechanism of another MS6.4 earthquake that occurred in 1986. In order to clarify the seismogenic characteristics of the two earthquakes, the relationship between the two faults and the Lenglongling main fault is analyzed. The coseismic deformation field of the 2016 earthquake was obtained by using Sentinel-1A data interferometry, and combined with high resolution image. The fine location of aftershocks and GPS data are used to study the structural style and seismic characteristics of the faults. The results show that the earthquake of 2016 occurred on a branch fault in the northern part of the Lenglongling fault zone. The earthquake caused the anticline fold uplift to occur on both sides of the branch fault. 2 earthquakes occurred at the east and west ends of the branch fault, which converged to the main fault of Lenglongling and converged. The geometric structure of left row, right order and left row left order is formed on the plane, and shear extrusion and shearing tension occur respectively in the whole shear environment of the region. As a result, the focal mechanism solutions of the two earthquakes are mainly compressive and tensional, and have both strike-slip properties. It is considered that the structural combination style between the branch fault and the main fault is the main factor leading to the solution of two different focal mechanisms. The seismic activities of .2 times all reflect the overall left-lateral strike-slip movement characteristics of the Lenglongling fault zone as a whole. The tectonic deformation mechanism also reflects the tectonic adjustment of the Qilian Haiyuan tectonic belt to the northeastern margin of the Qinghai-Tibet Plateau, that is, the tectonic movement from the Qinghai-Tibet plate is blocked by the Gobi Alashan block in the north and the North China craton block in the east. By adjusting a series of left-lateral strike-slip faults in the northeastern margin of Qinghai-Xizang Plateau, the direction of tectonic movement gradually rotates clockwise. The Menyuan earthquake makes it more urgent to study the seismic geological problems in the Lenglongling fault zone.
【作者單位】： 中國(guó)地震局地質(zhì)研究所;中國(guó)地震局地殼應(yīng)力研究所地殼動(dòng)力學(xué)重點(diǎn)實(shí)驗(yàn)室;
【基金】：中國(guó)地震局地殼應(yīng)力研究所基本科研業(yè)務(wù)專(zhuān)項(xiàng)(ZDJ201516,ZDJ201515);中國(guó)地震局地震行業(yè)科研專(zhuān)項(xiàng)(201408023)共同資助
【分類(lèi)號(hào)】：P315.2

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