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地科讲坛:加拿大西部盆地水力压裂诱发地震震源属性研究

作者:地科院时间:2019-04-15点击数:

主 讲 人:王蕊嘉

讲座地点:地科馆 511会议室

讲座时间:2019年4月16日 14:30

主讲人简介:

毕业于加拿大阿尔伯塔大学(2013-2018),博士后就任于加拿大韦仕敦大学,主要研究方向有:诱发地震,地震监测及定位,震源机制,统计地震学。研究成果发表于Geophysical Research Letter (3篇), Journal of Geophysics: Solid Earth (2018年最高引文章之一)等期刊。博士期间获得Canadian Geophysical Union (CGU, Solid Earth), American Geophysical Union (AGU), Seismological Society of American (SSA, East Section), 以及 Society of Exploration Geophysics (SEG)多项国际会议最佳口头报告奖。近年来参与担任AGU 和SSA诱发地震方向会议主持。即任于新墨西哥大学博士后,研究方向为火山地震学。

内容提要:

Seismicity rate in the Western Canada Sedimentary Basin (WCSB) has increased substantially in the past 5 years, mainly due to local hydraulic fracturing (HF) operations for shale gas exploration. Aside from consistent shallow (<5 km, above the basement) hypocenters, it has been suggested that the focal mechanisms of these earthquakes exhibit strong non-double-couple (non-dc) component similar to microseismic events. in this paper, we systematically analyze the source parameters and fault characteristics of intermediate (m~4) earthquakes in the wcsb. the resulting focal mechanisms show either major strike-slip (in central alberta) or thrust (e.g., along the canadian rockies) faulting mechanisms. we validate the induced nature of the newest seismic cluster (january 2016, crooked lake) via the spatial-temporal relationship between the seismic swarm and injections at a nearby hf well. in addition to characterizing the fault geometry, we also examined the statistic properties of both induced and natural earthquakes in this region.

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