Nucleation of earthquakes and its implication to precursors

• Published in: Acta seismologica sinica Vol. 13; no. 2; pp. 224 - 233
• Main Authors: Li, Shi-Yu, Teng, Chun-Kai, Lu, Zhen-Ye, Liu, Xiao-Hong, Liu, Qi-Liang, He, Xue-Song
• Format: Journal Article
• Language: English
• Published: Beijing Springer Nature B.V 01.03.2000; Institute of Geophysics, China Seismological Bureau, Beijing 100081, China; Opening Laboratory of Tectonophysics, China Seismological Bureau, Beijing 100081, China%Institute of Geophysics, China Academy of Sciences, Beijing 100101,China%Center for Analysis and Prediction, China Seismological Bureau, Beijing 100036,China%Institute of Geophysics, China Seismological Bureau, Beijing 100081, China
• Subjects: Anisotropy; Earthquakes; Friction; Microcracks; Microwave radiation; Nucleation; Plate tectonics; Precursors; Remote sensing; Rock; Rocks; Seismic activity; Seismic phenomena; Seismology; nucleation of earthquake microcracks damage earthquake precursors
• ISSN: 1000-9116; 1674-4519; 1993-1344; 1867-8777
• DOI: 10.1007/s11589-000-0014-y

The recent argument about nucleation phase of earthquakes reminds us to completely study the concept of earthquake nucleation. The original meaning of nucleation includes concentration, nucleation and initiation of the eruptive processes. Thus, it is needed to discuss how to exactly translate the word "nucleation" into Chinese in different fields. The basic concept of earthquake nucleation refers to microcrack concentration in rock. It causes local weakening and instability of the rock. The narrow sense of nucleation theory of friction constitutive is significant in friction of fault surfaces, but should not abuse everywhere unconditionally. In terms of thermodynamics, nucleation actually means the variety processes of multiple state parameters of rock. The nucleation is a project that covers multiple courses. In this paper, the studies of damage theory, fracture, earthquake rupture dynamics and constitutive of friction and their implication to earthquake nucleation are remarked. The recently developments are introduced, including the influence of tectonic on the earthquake nucleation process, the method of measuring medium anisotropy, especially shear wave splitting led by concentration and orientation of microcracks, and the experimental study of remote sensing of infrared and microwave radiation related to the nucleation, etc. This paper also discusses the characteristic of large earthquake nucleation, and the implication of above studies to precursors of strong earthquakes.[PUBLICATION ABSTRACT]