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Multidisciplinary Research on Fault Activity in the Western Part of the North Anatolian Fault Zone (The Second Phase)

北安纳托利亚断裂带西部断裂活动性多学科研究（第二期）

基本信息

批准号：
63041054
负责人：
HONKURA Yoshimori
金额：
$ 8.06万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Overseas Scientific Survey.
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

The aim of this research is to investigate fault activity in the western part of the North Anatolian Fault Zone. First we made seismic observations to examine microseismic activity in the so-called seismic gap area. The result of observations at 9 stations during three months indicates that seismic activity is very low at the southern section, whereas activity is high in the northern section. We also made a trenching work in order to reveal the recurrence rate of major earthquakes. It turned out that major earthquakes occur every 300-400 years. This rate is extremely short compared with active faults in Japan. Geomorphological work also delincated the extension of an active fault which has so far been vague. Electric and magnctic work disclosed anomalies associated with fault structure and based on the anomalies, continuous measurements of the geomagnetic field has been made at 7 stations. So far slight anomalous changes seem to have been detected in association with slight increase in seismic energy. Continuous electric measurements have also been made in the vicinity of the fault. Radon concentration in soil gas has been monitored routinely at some sites near the active fault. We complied these results in a report. We have been requested to send copies of this report to scientists over the world since we reported the results at an international meeting on earthquake prediction.

本研究的目的是调查北安纳托利亚断裂带西部的断层活动。首先，我们进行了地震观测，以检查所谓的地震空区的微震活动。9个台站3个月的观测结果表明，地震活动在南段很低，而在北方则很高。为了揭示大地震的复发率，我们还做了一项挖沟工作。大地震每300-400年发生一次。与日本的活断层相比，这个速率是极短的。地貌工作还划定了一个活动断层的延伸范围，迄今为止这一点还很模糊。电、磁工作揭示了与断裂构造有关的异常，并根据这些异常，在7个台站进行了地磁场的连续测量。到目前为止，似乎已经检测到轻微的异常变化与地震能量的轻微增加有关。在断层附近也进行了连续的电气测量。在活动断层附近的一些地点，对土壤气体中的氡浓度进行了常规监测。我们把这些结果汇编成一份报告。自从我们在一次国际地震预测会议上报告了这一结果以来，我们一直被要求将这一报告的副本发送给世界各地的科学家。