日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 S (固体地球科学) » S-GL 地質学

[S-GL28] 地域地質と構造発達史

2019年5月27日(月) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:大坪 誠(産業技術総合研究所 活断層・火山研究部門)、細井 淳(産業技術総合研究所地質調査総合センター地質情報研究部門)

[SGL28-P09] Seismicity along the Moradabad Basement Fault in the Central Ganga Plain: A Geological and Geophysical approach

*ANKIT GUPTA1Pitambar Pati1Chinmay Dash1 (1.Indian Institute of Technology Roorkee)

キーワード:Ganga Plain, Neotectonics, Basement Fault

The basement of Indo-Gangetic plain is characterized by various fault bounded ridges and troughs. These Basement faults have great influence on the Ganga Plain tectonics. In response to the stress generated along the Himalaya these basement faults propagate surface ward and affect the sediment cover. This results in the form of Earthquakes along these basement faults. The present study shows several field evidences of surface deformation caused by the Moradabad basement fault. Soft sediment deformation structures (seismites) and surface faults are found at four different locations on the trace of the Moradabad basement fault in the upper Ganga Plain. Ground Penetrating Radar (GPR) survey across the fault also provides evidence of shallow subsurface deformations. The epicenters of historical earthquakes are concentrated along the Moradabad basement fault. The deformations can be attributed to possible pre-historic earthquake events associated with Moradabad basement fault as other impulsive stresses like slope instability, flood surges and rapid sediment deposition are absent. Close association of these secondary faults and deformation structures with the Moradabad basement fault indicate their origin is due to the stress release along this fault generated by Himalayan tectonics.