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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Source characterization of the San Juan (Argentina) crustal earthquakes of 15 January 1944 (M-w 7.0) and 11 June 1952 (M-w 6.8)
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Source characterization of the San Juan (Argentina) crustal earthquakes of 15 January 1944 (M-w 7.0) and 11 June 1952 (M-w 6.8)

机译:1944年1月15日(M-w 7.0)和1952年6月11日(M-w 6.8)的圣胡安(阿根廷)地壳地震的震源特征

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The backarc region of the Andes in the vicinity of San Juan, Argentina, is one of the most seismically active fold and thrust belt regions in the world. Four large damaging crustal earthquakes (1894, 1944, 1952 and 1977) occurred during the last 111 yr between 30 degrees S and 32 degrees S. We have determined the source parameters for two of these important earthquakes, the 1944 and 1952 events, using historic seismic records. The earthquake on 15 January 1944 had an epicentral location between the eastern thin-skinned Precordillera fold and thrust belt and the thick-skinned Sierras Pampeanas basement-cored uplifts. The I I June 1952 earthquake occurred in the eastern Precordillera about 35 kin southwest of the 1944 epicenter location. The P-wave first motions, long-period teleseismic P waveform modeling, and SV/SH amplitude ratio indicate a thrust focal mechanism for the 1944 event (strike N45 degrees E, dip 35 degrees to the southeast, and rake 110 degrees) with M-0=3.01 x 10(19) N m and M-w=7.0. The 1952 earthquake focal mechanism solution indicates a more oblique mechanism (strike N40 degrees E, dip 75 degrees to the southeast, and rake 30 degrees) with M-0 = 2.20 x 10(19) N in and M-w= 6.8. Both the 1944 and 1952 earthquakes have focal depths < 12 km and simple source time functions with one pulse of moment release with durations of 10 s and 8 s, respectively. Both the shallow focal depth and the east-dipping fault plane in the focal mechanism solution for the 1944 earthquake are consistent with the parameters observed along the La Laja fault in the frontal part of the eastern Precordillera that generated a 6-8-km-long coseismic surface rupture. The 1952 earthquake focal mechanism solution and its shallow source depth suggest it is related to faults in the eastern Precordillera, but a particular fault association is difficult. The 1944 earthquake was clearly the most destructive event because its proximity to the most populated area in San Juan, large size and shallow focal depth. (c) 2006 Elsevier B.V. All rights reserved.
机译:阿根廷圣胡安附近的安第斯山脉的后弧地区是世界上地震活动最为活跃的褶皱和逆冲带地区之一。在过去的111年中,南纬30度至32度之间发生了四次破坏性较大的地壳地震(1894年,1944年,1952年和1977年)。我们使用历史记录确定了其中两次重要地震的震源参数,即1944年和1952年的地震地震记录。 1944年1月15日的地震位于东部薄皮的Precordillera褶皱和逆冲带与厚皮的Sierras Pampeanas基底为中心的隆起之间的震中位置。 1952年6月发生的地震在1944年震中位置西南35 kin处的东部Precordillera发生。 P波的初动,长时期的远震P波形建模和SV / SH振幅比表明了1944年事件的推力震源机制(北纬N45度,向东南倾35度,前倾110度)。 -0 = 3.01 x 10(19)N m和Mw = 7.0。 1952年的地震震源机制解表明了更倾斜的机制(北纬N40度,向东南倾75度,前倾30度),M-0 = 2.20 x 10(19)N in,M-w = 6.8。 1944年和1952年的地震都具有小于12 km的震源深度和简单的震源时间函数,分别具有一个10 s和8 s的矩释放脉冲。 1944年地震的震源机制解中的浅层震源深度和东倾断层平面都与东部Precordillera前部沿La Laja断层观测到的参数一致,该断层产生了6-8公里长同震表面破裂。 1952年的地震震源机制解及其浅层震源深度表明,这与东部前柏山脉的断层有关,但要建立一个特定的断层联系是困难的。 1944年的地震显然是最具破坏性的事件,因为它靠近圣胡安人口最多的地区,面积大,震源浅。 (c)2006 Elsevier B.V.保留所有权利。

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