Regional Earthquakes Recorded by Ocean Bottom Seismometers (OBS) and an Ocean Sub-Bottom Seismometer (OSS IV) on Leg 88
Regional Earthquakes Recorded by Ocean Bottom Seismometers (OBS) and an Ocean Sub-Bottom Seismometer (OSS IV) on Leg 88
复制标题
第 88 段海底地震仪 (OBS) 和海底地震仪 (OSS IV) 记录的区域地震
DOI：
10.2973/dsdp.proc.88.109.1987
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
F. Duennebier
中科院分区：
文献类型：
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作者：
R. Cessaro;F. Duennebier
在深海钻井项目（DSDP） Leg 88中，在581C孔中放置了一个海洋海底地震仪（OSS IV），并在孔周围部署了一系列海底地震仪（OBS）。它们一起提供了75天的连续地震活动记录。OBS阵列记录了11天，探测到80多次区域和远震地震，其中只有10次是由国家地震信息服务（NEIS）定位的。OSS IV记录了64天，提供了660次地震的记录，其中59次是由NEIS定位的。在距离小于12°的事件中，低频地幔P最先到达；在大多数中至浅深度事件中观测到高频海洋P （Po）和海洋S （So）到达。基于从6°到20°的33次地震样本的旅行时间曲线与以前在海洋中记录的震中距离为12°到28°的地震的观测结果非常吻合。海底地震仪记录的neis定位的区域性地震与OSS IV记录的地震的比较表明，钻孔地震仪在地震探测方面比海底仪器更敏感。本章对这些优秀的数据进行了初步的考察。
During Deep Sea Drilling Project (DSDP) Leg 88, an ocean sub-bottom seismometer (OSS IV) was placed in Hole 581C, and an array of ocean bottom seismometers (OBS) was deployed about the hole. Together they provided a 75-day continuous recording of seismic activity. The OBS array, recording for 11 days, detected more than 80 regional and teleseismic earthquakes, of which only 10 were located by the National Earthquake Information Service (NEIS). The OSS IV, recording for 64 days, provided records of 660 earthquakes of which 59 were located by NEIS. Low frequency mantle P arrivals are observed as first arrivals for events closer than 12°; high frequency ocean P (Po) and ocean S (So) arrivals are observed for most intermediate to shallow depth events. A traveltime curve based on a sample of 33 earthquakes from 6 to 20° agrees well with previous observations for earthquakes with epicentral distances from 12 to 28° recorded in the ocean. A comparison of the regional, NEIS-located earthquakes recorded on an OBS with those recorded on OSS IV suggests that the borehole seismometer is somewhat more sensitive for earthquake detection than ocean-bottom instruments. This chapter presents a preliminary examination of these excellent data.