...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth, planets and space: EPS >Hypocenter distribution of plate boundary zone off Fukushima, Japan, derived from ocean bottom seismometer data
【24h】

Hypocenter distribution of plate boundary zone off Fukushima, Japan, derived from ocean bottom seismometer data

机译：从海底地震仪数据推算日本福岛附近板块边界带的震源分布

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Microearthquake observation using Ocean Bottom Seismometers (OBSs) was carried out to obtain a detailed distribution of microearthquakes beneath the area off Fukushima, in the middle section of the Japan Trench in the summer of 1997. The observation period spanned approximately one month. Almost all of the well-determined hypocenters occurred in the vicinity of the plate boundary in this region (approximately 100 km landward of the trench axis), while seismicity is markedly lower between this area and the trench itself. The seaward limit of the high seismicity region is close to the western end of the zone of direct contact between the oceanic crust and the overriding landward crust. Twenty-nine earthquakes were recorded within the overriding landward plate. Twelve earthquakes were recorded about 30 km below the plate boundary, and form a landward dipping plane that appears to be an up-dip continuation of the lower plane of the double seismic zone. The microseismicity characteristics of the plate boundary region are interpreted to be controlled by the geometry and physical properties of the plate interface. The seismic activity in the lower seismic plane near the trench is considered to relate to bending of the subducting plate and to dehydration of serpentinized Pacific Plate mantle.
机译：进行了使用海底地震仪（OBSs）进行的微地震观测，以获取1997年夏季日本海沟中部福岛附近海域以下微地震的详细分布。观测期约一个月。几乎所有确定的震源都发生在该区域的板块边界附近（距沟槽轴线向后约100 km），而在该区域与沟槽本身之间的地震活动性明显较低。高地震活动区的向海界限靠近大洋地壳与上覆的陆向地壳之间直接接触区域的西端。在最重要的陆板内记录了29次地震。在板块边界以下约30 km处记录了十二次地震，并形成了一个陆上倾斜面，似乎是双重地震带下平面的上倾延续。板边界区域的微震特性被解释为受板界面的几何形状和物理特性控制。沟附近较低地震平面中的地震活动被认为与俯冲板的弯曲和蛇形化的太平洋板地幔的脱水有关。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号