Neotectonics in the northern part of Kinki Triangle Region, central Japan

本研究的主要目的是：(1)建立日本近畿三角地区北部晚第四纪沉积物的地层学和年代学；(2)估计晚第四纪的平均垂直滑动速率；(3)根据构造地貌资料、琵瓦湖和三田五湖等盆地的地层资料和地下物探资料进行新构造解释。研究结果概要如下。(1) 1996年三田五湖和琵琶湖的资料收集与评述，1997年花原断裂、约罗-延濑断裂和铃鹿-通断裂（铃鹿山脉东缘断裂）的资料收集与评述。(2) 1996年对三田五湖、琵琶湖、哈纳奥雷断裂、约罗-延濑断裂、铃木-屯断裂进行了构造地貌学研究。(3)根据挖沟、钻井、14C测年和地层年代学资料，对琵瓦湖以西的卡塔塔断裂带、哈纳奥雷断裂带、三卡塔断裂带和铃鹿断裂带的垂向位移速率进行了估算。(4)总结了地震反射测量（Yoro断裂和Katata断裂）和精确重力测量（Kyoto-Nishiyama断裂）的数据，并考虑了断裂系统的地表地貌特征与地下特征之间的关系。

The purpose of this study program was focused on(1) establishement of stratigraphy and chronology of the late Quaternary sediments distributed in the northern area of Kinki Triangle Region, Japan,(2) estimation of the average vertical slip rate during the late Quaternary,(3) neotectonic interpretation on the basis of tectonic geomorphological data, stratigraphical date in the basin such as Lake Biwa and Mikata Five Lakes, and subsurface geophysical prospecting data.The outline of the result of the research is as follow.(1) Data collection and review on Mikata Five Lakes and Lake Biwa in 1996, and Hanaore Fault, Yoro-Yanagase Fault, and Suzuka-Toen Fault (East border fault of Suzuka Mountains) in 1997.(2) Tectonic geomorphological study using air photographs was caried out on Mikata Five Lakes and Lake Biwa in 1996, and Hanaore Fault, Yoro-Yanagase Fault, and Suzuka-Toen Fault.(3) Vertical displacement rates were estimated on the Katata Fault (west of Lake Biwa), Hanaore Fault, Mikata Fault and Suzuka-Toen Fault on the basis of trenching, drilling, 14C dating and tephrochronological data.(4) Data by seismic reflection surveys (Yoro Fault and Katata Fault) and precise gravity measureme (Kyoto-Nishiyama Fault) were summarized and considered the relationship between the surface geomorphological features and subsurface characteristics along the fault system.