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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40611

Title: Array Observations for Narrow-Band Background Noises in the Hualien Area and Their Seismological Implications
Authors: Lai Ya Chuan
Huang Bor Shouh
Yen Hong Yuan
Chen Kou Cheng
Huang Yi Ling
Chen Yi Ru
Jiang Juen Shi
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: Seismic Array
Frequency-wavenumber analysis
Microtremors
Date: 2005-06
Issue Date: 2017-02-06T01:22:22Z
Publisher:  Terrestrial Atmospheric and Oceanic Sciences
Abstract: Abstract: Seismic observations in the Hualien area have been greatly disturbed by narrow-band background noise. Thus, the automatic earthquake trigging system of the Taiwan regional seismic network has been equally affected by the same background signals, the origin of which is still controversial. Herein, array measurements were conducted to account for this seismic noise and to recognize its seismic wave propagation properties. Five tem-porary arrays were designed to observe this background noise. Each array consisted of 15 three-component seismometers spaced from 100 to 300 meters apart. Observed data shows that a notable band limit background noise, in the frequency range of 1.3 to 1.7 Hz, was identified from its seismic power spectrum with strong separated peaks at 1.3 Hz, 1.4 Hz and 1.7 Hz. The origins and characteristics of the background noises were investigated us-ing frequency-wavenumber analyses and waveform stacking techniques. Analyzed results suggested that the feasible sources of the narrow-band signals were located near the southwest boundary of the survey area. Based on particle motion analysis, the narrow-band seismic signals were identi-fied as major Rayleigh wave type ground motions. In this survey area, microtremors were generated from multiple origins. However, the major signal sources remain stable in the southwest. Those signals were also ex-amined with regard to persistence over time from a permanent seismic sta-tion leading to the inference that the source of that background noise was industrial in origin.
Relation: 16(2)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40611
Appears in Collections:[Institute of Applied Geosciences] Periodical Articles

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