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M7.1 earthquake, Bulgaria, 1928-04-18

MagnitudeM7.1mw

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Depth10 km

Time (UTC)1928-04-18 19:22

Rank in 192813 / 119among M6+

Rank since 19001110 / 14,458

Energy vs an M6×45approx.

3 km W of Brezovo, Bulgaria · 42.35, 25.04

M6.5+ within 300 km (largest first)

1905 M7.2M7.2

1912 M7.2M7.2

1928 M7.1M7.1

1904 M7.0M7.0

1932 M6.9M6.9

2014 M6.9M6.9

1904 M6.8M6.8

1982 M6.8M6.8

1983 M6.8M6.8

1912 M6.7M6.7

1975 M6.7M6.7

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M7.1 1928-04-14	1928-04-14 09:00	10 km	9 km S of Stara Zagora, Bulgaria
M6.7 1913-06-14	1913-06-14 09:33	15 km	5 km NNE of Lyaskovets, Bulgaria
M6.7 1912-09-13	1912-09-13 23:31	15 km	30 km SW of Kumbağ, Turkey
M6.2 1912-08-10	1912-08-10 09:23	10 km	23 km NE of Biga, Turkey
M7.2 1912-08-09	1912-08-09 01:29	15 km	25 km SE of Malkara, Turkey
M6.1 1909-02-15	1909-02-15 09:33	15 km	11 km ENE of Elhovo, Bulgaria
M7.2 1905-11-08	1905-11-08 22:06	15 km	Aegean Sea
M6.1 1905-10-08	1905-10-08 07:27	15 km	15 km NE of Bobov Dol, Bulgaria
M7.0 1904-04-04	1904-04-04 10:26	15 km	7 km SE of Stara Kresna, Bulgaria
M6.8 1904-04-04	1904-04-04 10:02	15 km	6 km W of Stara Kresna, Bulgaria

Energy ratio uses the rule that one magnitude unit is about 32 times the energy. Magnitudes and locations are USGS values and can differ from national agencies. Older records are less complete and less precise.