Precise evaluation for buried active faults across the waste-filled valleys in the north area of Kinki Triangle

由于日本中部琵琶湖北部地区的Hatabe和Ariwara盆地被认为是由活动断裂形成的垃圾填充山谷，因此进行了地震反射调查，以澄清这些低地下的地下结构。由于阿里瓦拉盆地由较薄的沉积物组成，钻井测量不够充分。另一方面，由于Hatabe盆地被厚厚的晚第四纪沉积物覆盖，因此进行了全岩心钻探调查，以澄清该盆地下的地质柱状剖面。从垂向位移量和滑动速率两个方面揭示了哈塔贝盆地下方大角度西倾的隐伏断裂。

As Hatabe and Ariwara basins, the waste-filled valleys in the north area of Lake Biwa, central Japan, are assumed to have been formed by active faulting, seismic reflection surveys were carried out to clarify the subsurface structure under these lowlands. As Ariwara basin is composed to be relatively thin sediments, drilling survey is not adequate. As Hatabe basin is covered by thick Late Quaternary sediments on the other hand, all-core-drilling surveys were conducted to clarify geologic columnar sections under this basin. The buried fault dipping westward with high angle under the Hatabe basin has been revealed with the amount of vertical displacement and slip-rate.