...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Reinvestigation of the 1989 Mammoth Mountain, California seismic swarm and dike intrusion
【24h】

Reinvestigation of the 1989 Mammoth Mountain, California seismic swarm and dike intrusion

机译：对1989年加利福尼亚猛mm山的地震群和堤防入侵进行了重新调查

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

During the period of unrest and inflation beneath Long Valley, east central California, between 1988 and 1992, a swarm of seismic activity occurred beneath Mammoth Mountain, on the caldera rim in 1989 followed by the onset of diffuse CO_2 degassing. These events, combined with elevation changes along a leveling line north of Mammoth Mountain suggested a dike intrusion. An early inversion of deformation data resulted in a dike model with an unrealistically small amount of opening (13 cm) for the proposed dimensions. The current reinvestigation of the 1989 seismic event at Mammoth Mountain, CA incorporates relocated earthquakes (Prejean et al., 2003) and ellipsoidal inflation sources beneath the caldera to the east (Langbein, 2003) to better constrain the location and dimensions of a proposed dike intrusion beneath Mammoth Mountain. Assuming that the dike coincides with a "keel" of seismicity at 7-9 km depth, most of the dislocation parameters can be constrained. Fixing all dike parameters except opening to coincide with the keel, inversion of the local leveling data yields a dike with 3.3 m of opening. Allowing the dike height to vary as well improves the fit to the data significantly and results in a dike 1 m wide and nearly 7 m high. These results indicate that the intruded dike had significantly more opening than previously modeled. Magma volumes for reasonable models center around 0.015 km~3, suggesting a small, likely basaltic, intrusion.
机译：在1988年至1992年之间，在加利福尼亚州中部东部长谷以下的动乱和通货膨胀时期，1989年在破火山口边缘的猛mm山下发生了一系列地震活动，随后开始了弥散性CO_2脱气。这些事件，再加上猛Ma山以北的水平线上的海拔变化，表明有堤防入侵。变形数据的早期反演产生了堤防模型，该堤防模型的拟议尺寸具有不切实际的小开口（13 cm）。当前对1989年在加利福尼亚州猛mm山的地震事件的重新研究结合了重新布置的地震（Prejean等人，2003年）和东部破火山口下方的椭圆形充气源（Langbein，2003年），以更好地限制拟建堤坝的位置和规模猛Ma山下的入侵。假设堤坝与7-9 km深度的地震“龙骨”重合，则大多数位错参数都可以受到约束。固定除堤坝以外的所有堤防参数以使其与龙骨重合后，对本地平整数据的反演将产生堤坝的3.3 m开口。允许堤防高度变化也可以显着改善对数据的拟合度，并导致堤防宽度为1 m，高度为近7 m。这些结果表明，入侵堤坝的开口比以前建模的要大得多。合理模型的岩浆量大约在0.015 km〜3左右，表明有少量玄武岩侵入。

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