Tsunami deposits of September 21st 1985 in Barra de Potosí: comparison with other studies and evaluation of some geological proxies for southwestern Mexico

Ocampo-Rios Brenda Grisset; Roy Priyadarsi D.; Macías Ma. Consuelo; Jonathan M.P.; Lozano-Santacruz Rufino

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Tsunami deposits of September 21st 1985 in Barra de Potosí: comparison with other studies and evaluation of some geological proxies for southwestern Mexico

机译：1985年9月21日在巴拉德波托西的海啸矿床：与其他研究的比较和墨西哥西南部一些地质代理的评估

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Abstract:Residents of Barra de Potosí village in southwestern Mexico witnessed inundation by waves up to a distance of ~500 m from the shore after the Mw 7.5 earthquake on September 21st, 1985. Sediments deposited by the tsunami wave were identified near El Potosí estuary and their geological characteristics (sedimentology, mineralogy and chemical composition) were compared with pre-tsunami sediments and deposits from the nearby-unaffected area. Tsunami sediments were characterized by well and moderately well sorted (standard deviation: 0.4-0.7 Φ) fine sand (mean size: 2.13-2.47 Φ) and contain higher amounts of both finer and coarser fractions (negative to positive skewed) and had leptokurtic to extremely leptokurtic distribution. Sedimentological characteristics of tsunami and pre-tsunami deposits were similar. Abundance and association of heavy minerals were also comparable both in tsunami and pre-tsunami deposits. However, lower amounts of Br and Fe2O3 and higher SiO2 and TiO2 differentiate tsunami deposits from the pretsunami sediments. Comparison with sediments deposited during the tsunamis of March 14th, 1979, September 21st, 1985, and March 11th, 2011, in the region did not yield any characteristic signature. Except for stratigraphy (i.e., erosive base), other geological characteristic, was useful for identifying paleo-tsunami in the region, was observed.

机译：摘要：1985年9月21日发生Mw 7.5地震后，墨西哥西南部Barra dePotosí村的居民在距岸边约500 m处的海浪中淹没了海浪。海啸波沉积的沉积物在ElPotosí河口和附近被发现。将其地质特征（沉积学，矿物学和化学组成）与海啸前的沉积物和附近未受影响地区的沉积物进行了比较。海啸沉积物的特征是分类良好且中等分类（标准偏差：0.4-0.7Φ）的细砂（平均粒径：2.13-2.47Φ），并且含有更多和更少的粗级分和粗级分（负偏正），并且具有极轻的分布。海啸和海啸发生前的沉积物的沉积特征相似。在海啸和海啸发生前的沉积物中，重矿物的丰度和缔合度也相当。然而，少量的Br和Fe2O3以及较高的SiO2和TiO2可以将海啸沉积物与海啸沉积物区分开。与该地区1979年3月14日，1985年9月21日和2011年3月11日海啸期间沉积的沉积物的比较没有发现任何特征性信号。观察到除了地层学（即侵蚀基础）外，其他地质特征也可用于识别该地区的古海啸。

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《Geofisica internacional》 |2017年第1期|共13页
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Ocampo-Rios Brenda Grisset; Roy Priyadarsi D.; Macías Ma. Consuelo; Jonathan M.P.; Lozano-Santacruz Rufino;
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Tsunami deposits of September 21st 1985 in Barra de Potosí: comparison with other studies and evaluation of some geological proxies for southwestern Mexico

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