本文選題：GPS觀測 + 日本MW.地震　； 參考：《大地測量與地球動力學》2017年12期

【摘要】：基于GPS觀測的震后水平位移對2011年日本MW9.0地震的震后形變特征進行研究。震后近5a(截至2015-12),震后水平位移累積達到東向60~165cm,南向20~65cm,距離震中較遠處的G104、G105及J192站點觀測到的震后位移累積變化已超過同震位移,且震后形變還在持續(xù)。聯(lián)合震后余滑和粘彈性位錯理論模擬震后形變,利用這2種作用機制對震后GPS水平形變進行解釋。研究表明,震后余滑在震后形變最初階段起主要作用,但隨著時間增長而逐漸衰減,粘滯性松弛作用的貢獻隨著時間增長而變大,GPS觀測到的震后地表形變可由這2種機制結合得到較合理的解釋。利用震后GPS形變模擬估算地震區(qū)域的地幔粘滯系數(shù)在1.5×1019 Pa·s量級。
[Abstract]:Based on the horizontal displacement observed by GPS, the deformation characteristics of the 2011 MW9.0 earthquake in Japan were studied.After the earthquake, the accumulative horizontal displacement has reached 60,165cm in the east direction, 205cm in the south direction, and the accumulative variation of the post-earthquake displacement has exceeded that observed at the G104G105 and J192 stations far from the epicentre, and the post-earthquake deformation is still continuing.Combined with aftershock slip and viscoelastic dislocation theory, the post-earthquake deformation is simulated, and the GPS horizontal deformation after the earthquake is explained by these two mechanisms.The results show that the aftershock slip plays a major role in the initial stage of post-earthquake deformation, but gradually attenuates with the increase of time.The contribution of viscosity relaxation to the post-earthquake surface deformation observed by GPS can be reasonably explained by the combination of these two mechanisms.The GPS deformation simulation is used to estimate the mantle viscosity coefficient of the seismic region in the order of 1. 5 脳 1019 Pa / s.
【作者單位】： 中國地震局地震預測研究所(地震預測重點實驗室);
【基金】：國家自然科學基金(41274098) 中國地震局地震行業(yè)科研專項(201508010);中國地震局地震預測研究所基本科研業(yè)務費專項(2013IES0407)~~
【分類號】：P315.7
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本文編號：1765944