The earthquake catalog assembled contains all published focal mechanisms, and is probably complete for mb ≥ 6.5 for the years 1963–1986. The spatial and temporal relationships of the earthquakes within the subducting slab to the large thrust events in each region are appraised. A systematic analysis of 1130 focal mechanisms for intraplate earthquakes with mb ≥ 5.0 in the depth range 0–300 km is conducted for nine circum-Pacific subduction zones, all of which are known to have large interplate thrust events. Temporal variations of the latter type may potentially play an important role in assessing regions of uncertain seismic potential, and possibly even in earthquake forecasting. Numerous studies have further postulated that the intraplate activity is influenced by transitory regional stress regimes such as those associated with interplate thrust events. The focal mechanisms of intraplate earthquakes within subducting lithosphere are frequently used to infer large-scale stress regimes induced by slab-pull, bending or unbending, and lateral segmentation and undulations of the slab.
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