WDC for Geophysics, Beijing(中国地球物理学科中心)

Author-submitted data information

ID 427
Title Seismic waveforms of the Lg-waves and noises obtained in the Iranian Plateau
Creator Geng Yang
Subject Seismic Lg and noise waveforms
Publisher Xiukuan Zhao
Description Under the project of the China-Iran Geological and Geophysical Survey (CIGS) in the Iranian Plateau, the Geological Survey of Iran (GSI), the Institute of Geophysics and Geology of the Chinese Academy of Sciences (IGGCAS), and the Institute for Advanced Studies in Basic Sciences (IASBS) established three seismic networks during 2013-2018, including 65 and 132 broadband stations in western and eastern Iran, respectively. To explore the crustal Lg-wave attenuation and its tectonic implications for the Iranian Plateau, we collected the vertical components waveforms of 385 crustal earthquakes that occurred in the Iranian Plateau and its surrounding regions over a time period between October 2013 and June 2018, which were recorded at 197 CIGS stations. Lg energy is usually prominent in the group velocity window of 3.6-3.0 km/s. In this study, we use a 0.6 km/s-long group velocity window to scan the waveform between 3.7-2.9 km/s and determine the Lg window with the maximum energy. Here, the Lg-wave signals were sampled using a group velocity window between 3.7 and 2.9 km/s from the vertical component broadband regional waveform data. A time window of the same length was applied before the first P-wave arrival to sample the pre-event noise series. We also add 10% duration intervals both before and after the time windows to apply cosine tapers on the extended portions. We extracted the Lg and noise waveforms recorded by the CIGS stations and upload them to this Data Repository. The instrument response file RESP.ALL was also uploaded.
Contributor Lian-Feng Zhao
Date October 2013 - June 2018
Type All Lg and noise waveforms are stored in the standard SAC format in the folders named “cut_lg” and “cut_noise”, respectively. The example waveforms from the earthquakes on 2015/11/25 and 2016/07/14 are stored in the folder of “cut_example_event_waveforms”. The instrument response file RESP.ALL is stored in the folder of “Response”. The instrument response information for each station includes the response name in the first line, the segment number according to the time interval (1) in the second line, and the start and end dates in the third and fourth lines. The fifth line includes A0, sensitivity (m/s), constant (0.02), the number of poles, the number of zeros, input unit (1=m, 2=m/s) and input style (D=Displacement, V=Velocity), respectively. The next few lines list the real and imaginary parts of each pole and zero in turn.
Format SAC format in the file named by *.SAC
URL http://www.geophys.ac.cn/ArticleData/20220920CIGS_waveforms.zip
DOI 10.12197/2022GA028
Language eng
Rights Institute of Geology and Geophysics, Chinese Academy of Sciences