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北京五里营井流体前兆观测到的两次异常及讨论
高玲,徐平,邢成起
Author NameAffiliation
Gao Ling Earthquake Administration of Beijing Municipality Beijing 100080China 
Xu Ping Earthquake Administration of Beijing Municipality Beijing 100080China 
Xing Chengqi Earthquake Administration of Beijing Municipality Beijing 100080China 
摘要:
分析了延庆五里营井汶川M8.0地震和玉树M7.1地震数字化流体前兆观测资料,对比研究了五里营井流体在2次强震中的响应差异。结果显示,流体异常响应灵敏度与地震震级和观测点震中距有一定关系,地震震级越大,观测点距离震中越近,流体异常响应越灵敏。 2次大震前流体前兆都观测到氦气释放活动最先出现异常反应,其释放强度与震级有关,震级越大,异常变化越强烈,其中汶川地震He浓度释放短期内出现较大变化可能与不断的强余震活动和大震后的构造调整有关。2次大震发生后,氦气异常释放反而增加明显,这一过程有异常He的贡献。这一方面可能与6~9月是年变过程有关,另一方面也可能与五里营井热储型气体释放特征有关,地震孕育发生过程中,有大量的深部来源He释放出来进入地热系统并改变整个组成,在时间上较断裂型气体释放晚,并且异常消失的时间也会晚得多。2次强震流体映震响应差异可能与2次地震深部构造背景和动力机制差异有关。处于南北地震带的汶川地震与观测点所在东部地区的关联强于青藏高原内部的玉树地震。氦气可能是观测点所在地区监测地下深部气体异常活动的灵敏指标。
关键词:  地下流体 响应差异 强震 五里营井
DOI:
分类号:
基金项目:
Response Difference and Related Discussion of Digital Fluid Records of the Beijing Wuliying Well before Strong Earthquakes
Gao Ling,Xu Ping,Xing Chengqi
Abstract:
In this paper,the precursor response characteristics of digital fluid caused by the Wenchuan M8. 0 and Yushu M7. 1 earthquakes are studied,and the response difference of the observations of Wuliying well to the two strong earthquakes is compared. The result shows that the abnormal fluid response has a certain relationship with earthquake size and epicenter distance. The greater the earthquake,and the closer it is to the epicenter from the observatory,the more sensitive the response will be to fluid anomalies. Abnormal Helium release was first observed before both strong earthquakes in the fluid precursor observation. The release intensity is related to earthquake magnitude; the larger the magnitude,the stronger the abnormal changes. The large change in He release in a short period after the Wenchuan earthquake may be related to the continuous activity of strong aftershocks and the structural adjustment after the earthquake. Helium release increased significantly after both earthquakes,as contributed by the abnormal deep-sited Helium release. However,this process may be connected to the annual change from July to September or the hot-reservoir type gas release in the Wuliying well. In the earthquake preparation process, a large number of deep-derived Helium is released into the geothermal system and the entire composition is changed. Temporally,this gas release appears later than fault-type gas release,and the disappearance time of this anomaly is also much later. The response difference of the fluid precursor to the two strong earthquakes may be related to differences of deep structural setting and dynamic mechanism. It also shows there is a stronger correlation between Wenchuan M8. 0 earthquake in the North-South Seismic Belt and North China region than the Yushu M7. 1 earthquake in the internal Qinghai-Tibetan plateau. Helium gas can be a sensitive indicator for monitoring abnormal deep-gas activity of the region where the observation station is located. Hence,observation and research should be strengthened in the future.
Key words:  Underground fluid  Response difference  Strong earthquake  Wuliying well