Axial Seamount Focal Mechanisms

This page provides near-real-time focal mechanism estimates for earthquakes at Axial Seamount recorded by the Ocean Observatories Initiative (OOI) cabled array. For each recent event, the pipeline identifies the 6 most similar historical earthquakes from a base catalog of events with known focal mechanisms. Similarity is measured using a composite distance combining hypocenter location, P-wave first-motion polarities predicted by a deep learning model, and S/P amplitude ratios across seven OOI broadband stations (AS1, AS2, CC1, EC1, EC2, EC3, ID1). Focal mechanisms are inferred by analogy from the matched historical events using the HASH algorithm. Color coding: blue = Normal, red = Reverse, green = Strike-slip, black = Unclassified.

Maps are updated each pipeline run (approximately daily). Last updated: 08-Mar-2026 00:11:18 UTC