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首页> 外文期刊>Seismological research letters >Microseismicity of the Intraplate Northern Wabash Fault System and La Salle Anticlinorium, Illinois Basin, USA
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Microseismicity of the Intraplate Northern Wabash Fault System and La Salle Anticlinorium, Illinois Basin, USA

机译：美国伊利诺伊盆地板块内北部瓦布什断层系统和拉萨尔反候层的微震性

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Within the Illinois basin, the northern Wabash Valley seismic zone (WVSZ) and adjoining La Salle anticlinal belt have produced three moderate-sized earthquakes ranging from m(b) 4.7 to m(b) 5.2 in the past 50 years. However, few smaller events from this area are recorded in regional catalogs. The Wabash fault system extends from the junction of the Rough Creek and Cottage Grove faults in the south along the Wabash River into the La Salle anticlinal belt to the north. These faults extend through the Paleozoic and into the Precambrian basement. Two of these moderate-sized earthquakes occurred north of the terminus of the Wabash Valley fault system where it meets the La Salle anticline. The La Salle anticline, a Precambrian basement feature, is oriented northwest to southeast. The La Salle anticline creates up to a 750 m uplift in the above Paleozoic strata. This uplift creates faults within the Paleozoic strata and within the La Salle anticline. This study uses a nine-seismograph phased array near the southern terminus of the La Salle anticline to monitor the microseismicity of the region. Analyzing the seismicity of the region over a six-month period found 834 events. The vast majority were determined to be mine blasts or otherwise human induced. Two small earthquakes (M-L similar to 1.0) located near the La Salle anticline. These earthquakes likely occur on faults associated with the anticline. The lack of microearthquakes suggests the b-value of the La Salle region is lower than the typical value of 1. The b-value is consistent with other intraplate regions and previous studies of the WVSZ finding values nearer 0.7 or even potentially as low as 0.6.
机译：在伊利诺伊斯盆地内，北部的瓦巴什谷地震带（WVSZ）和毗连的拉萨尔背斜带在过去50年中产生了3次中级地震，范围从m（b）4.7到m（b）5.2。但是，区域目录中未记录该区域的较小事件。 Wabash断层系统从南部的Rough Creek断层和Cottage Grove断层沿Wabash河延伸到北部的La Salle背斜带。这些断层贯穿古生界并进入前寒武纪基底。这些中等规模的地震中的两次发生在Wabash谷断层系统末端与La Salle背斜交汇处的北部。拉萨尔背斜是前寒武纪的基底特征，其方向为西北向东南。 La Salle背斜在上述古生界地层产生了750 m的隆起。这种隆升在古生代地层内和拉萨尔背斜内产生断层。这项研究在拉萨尔背斜南端附近使用九台地震仪相控阵来监测该地区的微震性。分析该地区在六个月内的地震活动，发现了834个事件。绝大多数被确定是由地雷爆炸或其他人为诱发的。拉萨尔背斜附近发生了两次小地震（M-L近似于1.0）。这些地震可能发生在与背斜相关的断层上。缺乏微震表明拉萨尔地区的b值低于典型值1。该b值与其他板内地区一致，并且以前的WVSZ研究发现该值接近0.7甚至可能低至0.6 。

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