Notable Earthquake of the Week
Imperial Valley 1934 Earthquakes
Two powerful earthquakes struck the California/ Mexico border region during the last two days of December, 1934. The first quake registered M 6.7 and occurred at 5:52 am, December 30, in the Laguna Salada district south of Calexico.
The second quake measured M 7.1 and happened the following morning at 10:45 am in essentially the same epicentral area. Shaking was strong to intense, registering Modified Mercalli Intensity scale ratings of IX and X, respectively, (a relative shaking intensity scale from 1-12 shown in Roman Numerals).
Both quakes caused considerable damage in the Imperial Valley region and were felt as far away as Las Vegas, Nevada. Bridges were damaged, railroad tracks were twisted, and brick and masonry buildings collapsed. Irrigation ditches were severely damaged, and underground pipes were severed.

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