Axial Seamount Earthquake Catalog

Focal Mechanisms — Near-real-time focal mechanism estimates by Maochuan Zhang (Developing...)

This simple web site provides access to a near-real time catalog of earthquake detections and HYPOINVERSE locations for the Ocean Observatories Initiative cabled observatory at Axial Seamount. The catalog is updated hourly and efforts are made to backfill locations from intervals when the high-sample-rate data are diverted by the Navy but later released. NOTE: There are some inconsistencies in the seismic moments which I am working to resolve.

Catalog last updated at 12-Sep-2026 12:44:49 UTC (12-Sep-2026 05:44:49 Seattle) with locations up to 12-Sep-2026 13:00:00 UTC

Status of 200 Hz waveform data - Navy Diversion

Continuous Amplitude Seismic Monitoring (CASM) — 1-minute RSAM values from vertical seismic data. Using continuous 8 Hz data filtered to 1–2 Hz and 2–4 Hz.

Support for this work comes from the National Science Foundation.

This catalog should be cited as: Wilcock, W. S. D., M. Tolstoy, F. Waldhauser, C. Garcia, Y. J. Tan, D. R. Bohnenstiehl, J. Caplan-Auerbach, R. P. Dziak, A. Arnulf, & M. E. Mann (2016). Seismic constraints on caldera dynamics from the 2015 Axial Seamount eruption, Science, 354, 1395-1399. and

Wilcock, W. S. D., F. Waldhauser, & M. Tolstoy (2017). Catalogs of earthquake recorded on Axial Seamount from January, 2015 through November, 2015 (investigators William Wilcock, Maya Tolstoy, Felix Waldhauser). Interdisciplinary Earth Data Alliance. https://doi.org/10.1594/IEDA/323843.