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Study on Precise Location and Structure of Earthquakes in the Shanxi Reservoir, Zhejiang Province
  • ISSN号:0891-4176
  • 期刊名称:《中国地震研究:英文版》
  • 时间:0
  • 分类:P315.9[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学] S828.2[农业科学—畜牧学;农业科学—畜牧兽医]
  • 作者机构:[1]Earthquake Administration of Zhejiang Province, Hangzhon 310013, China, [2]Institute of Geophysics, CEA, Beijing 100081, China
  • 相关基金:This project was supported by the Science and Technology Project of Zhejiang Province (2007C330060) , and the Special Research Fund for Seismic Industry of China Seismological Bureau (200808068).
中文摘要:

山西水库地震是在最近的年,有少数的一个区域和更弱的地震里的南部的浙江省的重要地震事件。seismicity 显示出一个断断续续的特征和组分发。地震网络定位的震中没证明一个占优势的方向和 seismogenic 结构不是清楚的。在学习,非线性的想象的波浪旅行时间方程被线性化并且解决,并且来源位置,起始的想象的速度和旅行时间剩余被获得。然后,由作为时间加倍标准差,剩余,从经度产生的最大的错误,纬度,深度和想象的速度被计算。基因人口用最大的错误被组织,地震地点的结束结果被基因算法获得。有地震大部分是的表演专注于一架在垂直附近的、向西北面向的差错飞机的这个方法的山西水库地震的重定位的结果,和在飞机和到期的北方,到期的东方和垂直方向的正常之间的包括的角度是 46 ~, 44 ~,并且 87 ~分别地。结果与小地震的全面差错飞机答案的一致。地震的平均深度是 4.7km,最大的深度 9.5kin,和最小的深度 1.7km。震中显示出向西北的狭窄的 banded 分布,并且焦点的深度沿着西北方向增加了。在长带的西北结束长有大约 3.5km 的不连续的地震差距。使用 Borun 模型获得的来源参数的特征不与构造地震的显著地不同。地震压力落下关于 0.33MPa,并且平均压力落下是 0.88MPa。根据压力掉空间分发,在长带的西北结束的地震断绝片断在一个低压力落下地区。

英文摘要:

The Shanxi reservoir earthquakes are significant seismic events in southern Zhejiang Province in recent years, an area with fewer and weaker earthquakes. The seismicity showed an intermittent characteristic and group distribution. The epicenters located by the seismic network did not show a predominant direction and the seismogenic structure is not clear. In the study, the nonlinear imaginary wave travel time equation was linearized and solved, and the source position, initial imaginary velocity and travel time residuals were obtained. Then by doubling the standard deviation as time residuals, the maximum error generated from longitude, latitude, depth and imaginary velocity was calculated. The genetic population was structured using the maximum error and the end result of earthquake location was obtained by genetic algorithm. The result of relocation of the Shanxi reservoir earthquakes with this method shows that earthquakes are largely concentrated on a near-vertical, northwest oriented fault plane, and the included angles between the normal of the plane and the due north, due east and vertical directions are 46~, 44~, and 87~, respectively. The result is in agreement with that of comprehensive fault plane solutions of small earthquakes. The average depth of the earthquakes was 4.7km, the maximum depth 9.5kin, and the minimum depth 1.7km. The epicenters showed a northwestward narrow banded distribution, and the focal depth increased along the northwest direction. There was a discontinuous seismic gap of about 3.5km long at the northwest end of the strip. The characteristics of source parameters obtained by using the Borun model were not significantly different from that of tectonic earthquakes. Seismic stress drop was about 0.33MPa, and the average stress drop was 0.88MPa. According to the stress drop' spatial distribution, the seismic discontinuities segment at the northwest end of the strip is in a low stress drop zone.

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期刊信息
  • 《中国地震研究:英文版》
  • 主管单位:中国地震局
  • 主办单位:中国地震台网中心
  • 主编:陈颙
  • 地址:西城区三里河南横街5号中国地震台网中心
  • 邮编:100045
  • 邮箱:erc19871@163.com
  • 电话:010-59959419 59959420
  • 国际标准刊号:ISSN:0891-4176
  • 国内统一刊号:ISSN:11-2009/P
  • 邮发代号:
  • 获奖情况:
  • 国内外数据库收录:
  • 被引量:39