M 4.9 earthquake: North Pacific Ocean (Northern Mariana Islands) — September 21, 1991

M 4.9 earthquake: North Pacific Ocean (Northern Mariana Islands) — September 21, 1991. Epicenter 381 km N of Capitol Hill, depth 594 km, 18:08 Local (1991-09-21 08:08 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (381 km N, Northern Mariana Islands) — 18.62, 145.375

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