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首页> 外文期刊>Seismological research letters >The Historical Seismicity of the Loreto Region, Baja California Peninsula, Mexico (1684-1878)
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The Historical Seismicity of the Loreto Region, Baja California Peninsula, Mexico (1684-1878)

机译：Loreto Region，墨西哥Baja California Peninsula的历史地震性（1684-1878）

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Loreto, the earliest permanent Novohispanic settlement in the Californias, is located on the east coast of the Baja California peninsula between the oblique-divergent plate boundary in the Gulf of California and onshore crustal normal-fault segments with Quaternary activity belonging to the main gulf escarpment. This article documents earthquake intensity observations in the Loreto region during the Novohispanic and early Mexican periods (1684-1878) from primary historical sources and additionally includes (as E Electronic Supplement S1) a descriptive earthquake catalog (1684-1908) covering the entire central and southern parts of the Baja California peninsula. A major earthquake in A.D. 1810 is described in detail in a previously unpublished document preserved at Archivo General de la Nacion in Mexico City. The earthquake was destructive in Loreto and was followed by a tsunami. The damage area likely included San Ignacio, 200 km northwest of Loreto, and rockfalls were described from Loreto all along the main gulf escarpment to La Paz, 230 km to the south. The earthquake source was most likely the Farallón transform fault in the Gulf of California. Loreto was again razed in A.D. 1878 by an earthquake doublet that is documented by letters from eye witnesses and the report of a governmental rescue team from La Paz, published in contemporary Mexican and American newspapers. Because the reported damage is limited to Loreto, this was possibly a local crustal earthquake caused by a nearby fault of the main gulf escarpment such as the Loreto or Escondido fault. Based on the observed effects of the A.D. 1810 and 1878 earthquakes, Loreto has a significant seismic ground-shaking hazard and is highly vulnerable to amplification of seismic ground shaking and related fissuring and soil liquefaction, which can be explained by its location on unconsolidated alluvium of the coastal plain and the associated high groundwater level.
机译：Loreto是加州最早的常任诺中西班牙裔住宿，位于加利福尼亚州海湾和陆上地壳正常故障段之间的斜发行板边界之间的Baja加州半岛的东海岸，属于主要的海湾悬崖。本文在诺霍斯裔和墨西哥早期（1684-1878）中，来自初级历史来源的地震强度观察，并包括（作为电子补充S1）一个描述性地震目录（1684-1908）覆盖整个中央的地震目录（1684-1908） Baja California半岛的南部。在墨西哥城的Archivo General de La Nacion保留了先前未发表的文件中，在墨西哥城的前未发表的文件中详细描述了A.D.1810的一个主要地震。地震在Loreto毁灭了，然后是海啸。伤害区域可能包括San Ignacio，洛雷托西北200公里，落后于洛雷托落后于南·拉巴斯，南部230公里。地震来源很可能是加州湾的Farallón转换错误。 Loreto再次被A.D. 1878年被一个地震Doublet飙升，由Eye Agites的信件和La Paz的政府救援队的报告记录在当代墨西哥和美国报纸上。由于报告的损害仅限于Loreto，因此这可能是由大型海湾悬崖的附近断层引起的局部地壳地震，例如Loreto或Escondido断层。基于AD 1810和1878年地震的观察到效果，Loreto具有显着的地震震荡危险，并且极易受到地震地面振荡和相关裂缝和土壤液化的影响，这可以通过其在未溶解的加剧中的位置解释沿海平原和相关的高地下水位。

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