Investigation of Coulomb stress changes in south Tibet （central Himalayas） due to the 25th April 2015 Mw 7.8 Nepal earthquake using a Coulomb stress transfer model

作者：Xu Cheng,Guojie Meng

摘要：After M_W 7.8 Nepal earthquake occurred, the rearrangement of stresses in the crust commonly leads to subsequent damaging earthquakes. We present the calculations of the coseismic stress changes that resulted from the 25 th April event using models of regional faults designed according to south Tibet-Nepal structure, and show that some indicative significant stress increases. We calculate static stress changes caused by the displacement of a fault on which dislocations happen and an earthquake occurs. A M_W 7.3 earthquake broke on 12 May at a distance of * 130 km SEE of the M_W 7.8 earthquake, whose focus roughly located on high Coulomb stress change(CSC) site. Aftershocks(first 15 days after the mainshock)are associated with stress increase zone caused by the main rupture. We set receiver faults with specified strikes, dips,and rakes, on which the stresses imparted by the source fault are resolved. Four group normal faults to the north of the Nepal earthquake seismogenic fault were set as receiver faults and variant results followed. We provide a discussion on Coulomb stress transfer for the seismogenic fault, which is useful to identify potential future rupture zones.

發文機構：Institute of Earthquake Science

關鍵詞：應力變化8級地震尼泊爾力傳遞模型庫侖區域斷裂地震發生故障解決Coulomb stress changesElastic modelStress transferEarthquake riskNepal earthquake

分類號： P553[天文地球—構造地質學][天文地球—地質學]P315.75[天文地球—地震學][天文地球—固體地球物理學][天文地球—地球物理學]