The 1984 July 19 North Wales earthquake—a lower crustal continental event indicating brittle behaviour at an unusual depth

Jim Ansell*, Willey Aspinall, Geoffrey King, Rob Westaway

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

9 Citations (Scopus)

Abstract

Summary. Attention has recently been focused on the structure and composition of the lower crust in continental areas. It is generally believed that, except in special circumstances, ductile behaviour below mid‐crustal depths precludes the brittle processes that cause earthquakes. The 1984 July 19 earthquake in North Wales occurred at the unexpected depth of 23 km. We report here the location of the larger aftershocks and the relocation of the main shock with respect to one of them. The lower crustal depths of the events are confirmed by tests with a wide range of models. The occurrence of earthquakes at these depths may be related to low heat flow in the region.

Original languageEnglish
Pages (from-to)201-206
Number of pages6
JournalGeophysical Journal of the Royal Astronomical Society
Volume84
Issue number1
DOIs
Publication statusPublished - 1 Jan 1986

Keywords

  • earthquake
  • intraplate
  • North Wales

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