Processed multichannel seismic data in the Bering and Chukchi seas off Alaska, acquired during the R/V Maurice Ewing survey EW9410 (1994)

Stanford University, in conjunction with the U.S. Geological Survey, and with participation by the Institute of the Lithosphere and the Institute of the Russian Academy of Sciences, and the Geodynamics Research Institute of Texas A and M University, conducted deep seismic investigations of the continental crust beneath the Bering and Chukchi Seas, Alaska, during the month of August, 1994. The data was recorded to two-way travel-times of 15 to 23 seconds, with 50-75 m shot spacing. Two north-south transects were profiled. The eastern transect extended from 58 degrees 50'N, 168 degrees 32'W, well within the continental shelf of the Bering Sea, north of the Pribilof Islands, to just south of the shelf edge north of Barrow, Alaska, at 71 degrees 49'N, 154 degrees 33'W. Ice prevented continuation of the line beyond the shelf edge. The western transect extended from the central Chukchi Sea, well within the shelf at 71 degrees 23'N, 163 degrees 00'W, into the Aleutian basin at 58 degrees 00'N, 178 degrees 30'W, near Navarinsky Canyon. An additional short line crossing over the Beringian margin a second time was recorded near Zemchung Canyon east of the western transect. The profiles cross important strike-slip faults, possible terrane boundaries, two continental margins, and several Cretaceous/Tertiary sedimentary basins (Norton, Hope, Chukchi, and Navarin Basins). Together with the preceding cruise EW9409, the profiles provide a continuous transect across the North American continent, from the Pacific to Arctic Ocean. Most of the multi-channel (MCS) data is of high quality, but bad weather, strong currents, and recording problems sometimes presented difficulties during data acquisition. Gravity, magnetic, and sonobuoy data were also recorded along the profiles. Wide-angle recording was done in conjunction with the seismic profiling, at recording sites located along the central west coast of Alaska and the Chukchi Peninsula, as well as on islands in the Bering Strait and Bering Sea. The purpose was to conduct deep seismic investigations of the continental crust beneath the Bering and Chukchi Seas. Funded by NSF grant OCE93-17087.

斯坦福大学与美国地质调查局联合，并得到地壳研究所、俄罗斯科学院地壳研究所及德克萨斯A&M大学地球动力学研究所的参与，于1994年8月对阿拉斯加白令海和楚科奇海下的大陆地壳进行了深部地震调查。数据记录了往返旅行时间在15至23秒之间，炮点间距为50至75米。进行了两条南北向的剖面测量。东部剖面从北纬58度50分、西经168度32分，位于白令海大陆架内，北接普里比洛夫群岛，向南延伸至阿拉斯加北巴罗市北部大陆架边缘的北纬71度49分、西经154度33分。由于冰层阻碍，剖面线未能继续延伸至大陆架边缘。西部剖面从楚科奇海中部，位于大陆架内北纬71度23分、西经163度00分，延伸至阿留申海盆，北纬58度00分、西经178度30分，靠近纳瓦林峡谷。在西部剖面东侧的泽姆丘恩峡谷附近，还记录了一条额外的短剖面线，该线跨越了白令海边缘。这些剖面线横跨了重要的走滑断层、可能的构造单元边界、两个大陆边缘以及数个白垩纪至第三纪沉积盆地（诺顿盆地、希望盆地、楚科奇盆地和纳瓦林盆地）。与先前的EW9409航次相结合，这些剖面提供了从太平洋至北冰洋的北美洲大陆的连续横断面。大部分多道地震（MCS）数据质量较高，但在数据采集过程中，恶劣天气、强流和记录问题有时带来了困难。沿剖面线还记录了重力、磁力和声学浮标数据。在阿拉斯加西海岸中央、楚科奇半岛以及白令海峡和海上的岛屿上的记录站点进行了宽角记录，其目的是对白令海和楚科奇海下的大陆地壳进行深部地震调查。该项目由NSF资助，资助编号为OCE93-17087。