@article{ref1,
title="Characteristics of Foreshock and Its Identification",
journal="Acta seismologica sinica. English edition",
year="2005",
author="Wang, Li-Yu and Chen, Peter Y. and Wu, Zheng-Lai and Bai, TX",
volume="18",
number="2",
pages="180-188",
abstract="In the paper, we analyze 117 moderate-strong earthquakes occurred in Chinese mainland (Msub-s greater than or equal 5.5 in the east and M sub-s greater than or equal 6.0 in the west) since 1970, among them, 11 earthquakes (about 9%) have direct foreshocks and 63 earthquakes (about 51%) have generalized foreshocks. The predominant time interval between foreshock and main earthquake is no more than 30 days with a spatial distance less than 50 km and a magnitude difference over 1. From the digital seismic data in Liaoning Province, we know that direct foreshock had an obvious shear-stress background before the M sub-s=5.6 and M sub-s=5.1 Xiuyan earthquakes occurred on Nov. 29, 1999 and Jan.15, 2000.   <p>Language: en</p>",
language="en",
issn="1000-9116",
doi="",
url="http://dx.doi.org/"
}