M 4.8 earthquake: North Pacific Ocean (Northern Mariana Islands) — September 28, 1975

M 4.8 earthquake: North Pacific Ocean (Northern Mariana Islands) — September 28, 1975. Epicenter 376 km N of Capitol Hill, depth 121 km, 13:18 Local (1975-09-28 03:18 UTC). Readings from every reporting agency, affected towns, aftershock sequence.

North Pacific Ocean (376 km N, Northern Mariana Islands) — 18.574, 146.081

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