Characteristics of karst caves inferred from microtremor studies: A case study from Cerme Cave, Yogyakarta, Indonesia

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Gatot Yuliyanto, None Muhammad Irham Nurwidyanto
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引用次数: 0

Abstract

A microtremor survey based on ground surface data acquisition was used to identify and characterize the karst area of Cerme Cave, Yogyakarta, Indonesia, from the entrance to the exit of the cave. The entrance and exit of the cave are used as tie-in points because the characteristics of the two locations can be directly observed. Parameters used in this study include ground vibration amplification, shear wave velocity, and Poisson’s ratio. The presence of cavities can be characterized by a relatively strong contrast between these physical parameters and their surroundings. The exit of the cave, which can be considered as a sinkhole, has a dominant frequency of 3.2 to 4.6 Hz, which is relatively higher than that of the surrounding area. At the entrance of Cerme Cave, which has a large cavity, a small ground vibration amplification was detected, less than 0.1. The entrance and exit of the cave also exhibit a low shear wave propagation velocity of less than 350 m/s. The presence of a subsurface fluvial channel in Cerme Cave can be characterized by a high Poisson’s ratio of 0.4–0.5, a gain value of less than 0.1, and a shear wave velocity of less than 350 m/s.
由微震研究推断的溶洞特征:以印尼日惹Cerme溶洞为例
采用基于地面数据采集的微震测量方法,对印度尼西亚日惹Cerme洞穴从入口到出口的喀斯特区域进行了识别和表征。由于洞口和洞口可以直接观察到洞口和洞口的特点,所以将洞口和洞口作为切入点。本研究使用的参数包括地面振动放大、横波速度和泊松比。空腔的存在可以通过这些物理参数与其周围环境之间的相对强烈的对比来表征。洞口可视为天坑,其主导频率为3.2 ~ 4.6 Hz,相对高于周边区域。在Cerme洞穴洞口处,地面振动放大较小,小于0.1。洞口和洞口的横波传播速度也较低,小于350 m/s。Cerme溶洞具有高泊松比0.4 ~ 0.5,增益值小于0.1,横波速度小于350 m/s的地下河道特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Carsologica
Acta Carsologica 地学-地球科学综合
CiteScore
1.50
自引率
14.30%
发文量
0
审稿时长
>12 weeks
期刊介绍: Karst areas occupy 10-20 % of ice-free land. Dissolution of rock by natural waters has given rise to specific landscape and underground. Karst surface features and caves have attracted man''s curiosity since the dawn of humanity and have been a focus to scientific studies since more than half of millennia. Acta Carsologica publishes original research papers and reviews, letters, essays and reports covering topics related to specific of karst areas. These comprise, but are not limited to karst geology, hydrology, and geomorphology, speleology, hydrogeology, biospeleology and history of karst science.
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