MRI: Development of an Integrated Borehole Geodetic and Seismic Sensor

加州大学圣地亚哥分校的斯克里普斯海洋学研究所将制作新一代地球灵敏运动探测器的原型。这种基于光纤的传感器被部署在深钻孔中，记录人类头发宽度大小的运动，时间跨度从几分之一秒到几年不等。新的仪器包将记录从突然地震到不产生地震波的缓慢运动的行为。该仪器可位于人类附近存在危险断层或火山灾害的地方，以及可能发生与提取或注入流体有关的诱发地震的地方。这个项目与美国国家科学基金会的使命是一致的，即促进科学的进步，促进国家的健康、繁荣和福利。斯克里普斯海洋学研究所将开发一套大地测量/地震仪，可以探测到一系列与地震有关的现象，从突然滑动到连续缓慢滑动和间歇性震颤。该软件包将为理解断层运动的物理特性提供关键数据。这种基于光纤的传感器具有较长的仪器寿命，并且能够抵抗井下高温。综合仪器将测量垂直和水平地面速度、重力、倾斜和应变。原型仪器将安装在Pinon Flat天文台现有的钻孔中，与现有的地震和应变系统进行测试和比较。新的一揽子计划预计将大大扩展陆地和海底的大地测量/地震观测网络。

The Scripps Institution of Oceanography of the University of California San Diego will prototype a new generation of sensitive motion detector of the earth. The fiber-optic-based sensors are deployed in deep boreholes and record movements as small as the width of a human hair over times that range from a fraction of a second to years. The new instrument package will record behavior from sudden earthquakes to slow movements that do not generate seismic waves. The instrument can be located where dangerous faults or volcanic hazards exist near human populations, as well as where induced earthquakes associated with fluid extraction or injection might occur. This project is aligned with NSF's mission of promoting the progress of science to advance the nation's health, prosperity, and welfare. The Scripps Institution of Oceanography will develop a geodetic/seismometer package that can detect a range of earthquake-related phenomena from sudden slip to continuous slow slip and episodic tremor. The package will provide key data for understanding the physics of fault movement. The robust fiber-optic-based sensors will have a long instrument lifetime and be resistant to high downhole temperatures. The comprehensive instrument will measure vertical and horizontal ground velocities, gravity, tilt, and strain. The prototype instrument will be installed in an existing borehole at the Pinon Flat Observatory for testing and comparison with existing seismic and strain systems. The new package is expected to significantly expand the network of geodetic/seismic observations both on land and beneath the sea floor.