A Prototype Ocean Seismic Network (OSN) Deep-Sea Borehole Seismograph

研究目的是对现有的 最终安装在海洋钻孔中的宽带地震计 OSN-1，由ODP于1991年3月钻探（第136航次）。 增强 通过增加海洋， 地面地震观测站将改善地震定位， 可以更准确地确定地球深部的速度 结构 %%% 了解地震发生的原因和地点对于 减轻这些自然灾害。 地球的运动 地震还提供了地球深部的详细信息 结构 这些信息对于理解这种 地球的磁场，以及地球磁场的分布。 地球表面的矿产资源。 我们衡量 然而，地震受到地理条件的严重限制， 地震仪的放置 在此，三分之二的 被水覆盖的地球表面 地震仪覆盖范围 井中地震仪的安放 海洋-海底下观测站是提出的一种解决办法。这 研究是建立海洋网络的第一步 观测站：钻孔的修改和陆地测试 一种能在宽频带上记录地球运动的地震计， 频率.

The research objective is modification and testing of an existing broadband seismometer for eventual installation in ocean borehole OSN-1, drilled by the ODP in March of 1991 (Leg 136). Augmentation of world-wide seismograph coverage through the addition of ocean floor seismic observatories will improve earthquake location, and allow the more accurate determination of deep Earth velocity structure. %%% Understanding why and where earthquakes occur is essential to mitigating these natural hazards. The earth motions induced by earthquakes also provide detailed information on deep earth structure. Such information is crucial to understanding such phenomena as the Earth's magnetic field, and the distribution of mineral resources on the Earth's surface. Our ability to measure earthquakes, however, is severely limited by geographic constraints on the placement of seismometers. Heretofore, the two-thirds of the Earth's surface that is water-covered has been inaccessible to seismometer coverage. Emplacement of borehole seismometers in ocean-sub-seafloor observatories is one solution proposed. This research is the first step in the creation of a network of ocean observatories: the modification and land-testing of a bore-hole seismometer capable of recording earth motions over a wide band of frequencies.