Ocean Bottom Seismographic Survey of the Earthquake Swarm which occur beneath Mid Atlantic Ridge.

中大西洋海岭是板块（岩石圈）诞生的地方。由于通常的陆基地震仪太远，无法研究山脊，我们利用30-50灵敏的便携式OBSs（海底地震仪）进行详细的微震观测和折射研究，以研究详细的地壳/上地幔结构。1994年、1995年和1996年，我们在大西洋上发现了30个大洋洋底活动。1994年，我们在大西洋做了两个实验：一个在雷克雅内斯海脊，另一个在比斯开湾。在前者中，我们成功地获得了详细的震源分布和脊下的结构。在后者中，我们成功地发展了一种利用单泡脉冲气枪和灵敏的OBS相结合的强可控源测量方法来研究地壳/上地幔结构，并于1995年在某地区进行了广泛的OBS-气枪折射测量 ...更多信息 从冰岛北部的中大西洋海岭的一部分科尔贝因西海岭，到被认为是大西洋诞生前的残留大陆的扬·梅恩海岭。我们成功地获得了从Kolbeinsey Ridge到Jan Mayn Ridge整个样带的连续详细结构，这对于研究大西洋开放历史非常重要。1996年，我们还在大西洋进行了两次实验：一次在挪威附近的Voring盆地，另一次在Reykjanes Ridge到冰岛的过渡区。前者是为了说明挪威附近非常详细的地壳结构，在那里，大西洋开口的残余起源被保存在流动玄武岩之下。流动玄武岩是海洋中常用的地震反射方法非常难以穿透的岩石，但我们的OBS折射测量可以穿透到地层之下。后者是研究从雷克雅未克海脊到冰岛的过渡下的微地震，这对研究冰岛和海脊是如何形成的至关重要。并在该区进行了控震源研究，以阐明该过渡带的详细地壳结构。我们使用了30个OBS加47个临时陆地地震仪进行这项研究。少

Mid-Atlantic Ridge is the place where plate (lithosphere) is being born.. Because usual land-based seismographs are too far to study Ridges, we made use of 30-50 sensitive portable OBSs (Ocean Bottom Seismographs) to make detailed microearthquake observations and refraction studies to study detailed crustal/upper mantle structures. Also we studied Atlantic passive margins, which is a remnant of spreading of the Atlantic Ocean.We brought about 30 OBSs to the Atlantic in 1994,1995 and 1996. In 1994 we made two experiments in the Atlantic : one on the Reykjanes Ridge and the other in the Bay of Biscay. In the former, we succeeded to obtain a detailed hypocentral distribution of microearthquakes, and the structure beneath the Ridge. In the latter, we succeeded to develop a powerful controlled source survey to study crustal/upper mantle structure, with a combination of the single-bubble pulse airgun and the sensitive OBS.In 1995 we made an extensive OBS-airgun refraction survey in a region … More from Kolbeinsey Ridge, which is a part of Mid-Atlantic Ridge north of Iceland, to Jan Mayn Ridge, which is thought a remnant continent before the Atlantic was born. We have succeeded to obtain a continuous detailed structure for the whole transect from Kolbeinsey Ridge to Jan Mayn Ridge, which is quite important to study the history of opening of the Atlantic Ocean.In 1996 we also made two experiments in the Atlantic : one on the Voring Basin off Norway and the other in the transition from Reykjanes Ridge to Iceland. The former was to illustrate a very detailed crustal structure off Norway, where a remnant initiation of the opening of the Atlantic is kept beneath the flow basalt. The flow basalt is very impenetrable rock for the usual seismic reflection method used in the sea, however our OBS refraction survey can penetrate beneath the layr. The latter was to study micro-earthquakes beneath the transition from Reykjanes Ridge to Iceland which is essential to study how Iceland and the Ridge was formed. We also made controlled source study in this area to elucidate detailed crustal structure of the transition. We used 30 OBS plus 47 temporary land seismographs for this study. Less