Similarity of anomalous sea level pressure fields during the July 1986 and September 1987 southern California Quakes—Accidental or Indicative?

Abstract

Moderate size earthquakes in Southern California in July 1986 and October 1987 were associated with similar antecedent monthly mean anomaly patterns of sea level pressure over the far western contiguous United States and eastern North Pacific. This apparent relationship and a long time series of such patterns in past Julys and Octobers suggest that further research of this nature might be of value in earthquake prediction.