M 4.9 earthquake in Vietnam (Ha Giang) — August 18, 1975

M 4.9 earthquake in Vietnam (Ha Giang) — August 18, 1975. Epicenter 22 km SE of Ha Giang, depth 33 km, 22:20 Local (1975-08-18 15:20 UTC). Shaking felt by ~6.7M people. Readings from every reporting agency, affected towns, aftershock sequence.

22 km SE of Ha Giang (Vietnam) — 22.729, 105.16

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