JpGU-AGU Joint Meeting 2017

講演情報

[EJ] ポスター発表

セッション記号 S (固体地球科学) » S-SS 地震学

[S-SS10] [EJ] 地殻変動

2017年5月22日(月) 15:30 〜 17:00 ポスター会場 (国際展示場 7ホール)

コンビーナ:道家 涼介(神奈川県温泉地学研究所)、落 唯史(国立研究開発法人産業技術総合研究所 地質調査総合センター 活断層・火山研究部門)

[SSS10-P07] Coseismic deformation and tectonic implications of the 2016 M6.6 Meinong earthquake, Taiwan

*Ray Y Chuang1Kuo-En Ching2Manabu Hashimoto3Ruey-Juin Rau4Ling-Ho Chung5 (1.Department of Geography, National Taiwan University、2.Department of Geomatics, National Cheng Kung University、3.Disaster Prevention Research Institute, Kyoto University、4.Department of Earth Sciences, National Cheng Kung University、5.Department of Earth and Environmental Sciences, National Chung Cheng University)

キーワード:Coseismic deformation, InSAR, GPS

A M6.6 earthquake occurs at Meinong, Taiwan at 03:57:27 on February 6, 2016 local time (UTC+8). This earthquake caused severe damage and 117 deaths around several towns of Tainan City. We estimate coseismic displacements from continuous GPS and InSAR images. We process GPS daily solutions and calculate coseismic displacements from the differences between average positions for seven days before the earthquake and average positions for four days after the earthquake. The maximum horizontal displacement is about 5 cm and maximum vertical displacement is about 9 cm from GPS. We conduct dislocation models to estimate fault slip and fault geometry and the results show that the main slip area is at depths of 10-20 km and the orientation of the fault plane is E-W dipping to the north. In addition, we process ALOS2 images and the results show a region of deformation 10 km west of the hypocenter. The deformation region shown in InSAR results indicates deformation in mudstone at shallow depths, which is different from the dislocation model. This shallow deformation pattern is consistent with preseismic deformation pattern constrained from PS-InSAR and leveling. The shallow deformation might be controlled by local stress condition in the mudstone area.