Encyclopedia of Solid Earth Geophysics

Living Edition
| Editors: Harsh K. Gupta

Earthquake, Foreshocks

  • Mian LiuEmail author
Living reference work entry
DOI: https://doi.org/10.1007/978-3-030-10475-7_203-1

Synonyms

Definition

Foreshocks. Smaller earthquakes preceding a large earthquake (the mainshock) in an earthquake sequence.

Introduction

Earthquakes typically occur in sequences that may include foreshocks, the mainshock (the largest event or events), and aftershock (“Earthquake, Aftershocks”). Earthquake sequences without a clear mainshock are called swarms.

Foreshocks are the most obvious premonitory phenomenon of earthquakes. They are thought to indicate earthquake nucleation and hence may have the potential for short-term earthquake prediction (Scholz 2002). However, proof of the physical link between foreshocks and earthquake nucleation is inconclusive, and earthquake prediction using foreshocks has not been reliable.

The problem begins with their recognition – foreshocks are earthquakes that are called foreshocks retrospectively, when a large event (the mainshock) followed. To be considered as foreshocks, these events need to occur within certain spatial and temporal...

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Geological SciencesUniversity of MissouriColumbiaUSA