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首页> 外文期刊>Seismological research letters >Characteristics of Induced/Triggered Earthquakes during the Startup Phase of the Guy-Greenbrier Earthquake Sequence in North-Central Arkansas
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Characteristics of Induced/Triggered Earthquakes during the Startup Phase of the Guy-Greenbrier Earthquake Sequence in North-Central Arkansas

机译：阿肯色州中北部Guy-Greenbrier地震序列启动阶段诱发/触发地震的特征

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摘要

Between August 2010 and June 2011, an intense sequence of induced earthquakes occurred along the Guy-Greenbrier fault in central Arkansas due to fluid injection at nearby waste disposal wells. A previous study by Horton (2012), limited to similar to 1000 earthquakes having M-D > similar to 2.0, illuminated the similar to 13 km fault. We present an updated catalog of 17,395 earthquakes that is complete between 0 <= M-L <= 4.4 between August 2010 and 20 October 2010, with earthquakes located using an updated 1D velocity model for the region. The inclusion of the small-magnitude events reveals that seismicity starts below the SRE injection well a month earlier than estimated using only M-D > 2 events. During this period of time, the seismicity migrated from north to south, enhancing the resolution of three joined sections that form the northern similar to 7.3 km portion of the fault, which plunges southward. The seismogenic zone covers the lower portion of the Paleozoic sedimentary layers and extends into the crystalline Precambrian basement (similar to 3 km < z < 7.5 km). Earthquake size distribution varies along the fault, with most M-L > 3 events constrained within the basement. A b-value of 1.01 was obtained for the updated catalog during this period, with the b-value varying between 1.37 and 0.72 for different clusters of events. The seismicity pattern at depth is coincident with structural geologic features observed within the Fayetteville Shale (at similar to 1500 m depth).
机译：在2010年8月至2011年6月之间，阿肯色州中部的Guy-Greenbrier断层沿附近的废物处理井注入了大量强烈的诱发地震。霍顿（Horton）（2012）的先前研究仅限于类似的1000次地震，其M-D>相似于2.0，它阐明了相似的13 km断层。我们提供了2010年8月至2010年10月20日之间0≤M-L≤4.4之间完成的17395处地震的更新目录，使用该地区的更新1D速度模型定位了地震。包含小震级事件表明，地震活动比仅使用M-D> 2事件估计的时间早一个月，在SRE注入以下开始。在此期间，地震活动度从北向南迁移，从而增强了形成北部的三个连接段的分辨率，类似于断层的7.3 km，该断层向南倾斜。地震发生带覆盖了古生代沉积层的下部，并延伸到结晶的前寒武纪基底中（类似于3 km 3事件被限制在地下室内。在此期间，更新目录的b值为1.01，对于不同的事件簇，b值在1.37和0.72之间变化。深度的地震活动模式与在费耶特维尔页岩内（约1500 m深度）观察到的结构地质特征一致。

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