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一、环境北京基准地震台即白家疃地震台是国家地震局的第一类基本台。它位于北京西北郊颐温公路白家疃村南,京西九龙山——香峪大梁向斜北翼山前倾斜平原上。台基为洪积层,奥陶系灰岩埋藏于54米以下,上部为沙土层、沙砾层和卵砾层所覆盖,地下水位在15—20米左右。台内南部是地磁观测区,建有地磁绝对观测室、7米深的相对观测地下室、地磁实验室、地磁传输观测室和三个地磁比测观测亭,
First, the environment Beijing benchmark seismic station that is Baijiatan Seismostation National Seismological Bureau is the first type of basic station. It is located in the northwestern suburbs of Beijing Baiyun Park Road, south of Baijiatong, West Kowloon-Xianggong girder syncline north slope of the plains. The basement is the alluvial layer, Ordovician limestone buried below 54 meters, the upper part of the sand layer, gravel layer and gravel layer covered, groundwater level in 15-20 meters. The southern part of Taiwan is a geomagnetic observational area with an absolute observatory of geomagnetism, a relative observing basement of 7 meters, a geomagnetic laboratory, a geomagnetic transmission observation room and three geomagnetic observatory pavilions.