Daily Mail News – Science & Tech
By CHRIS MELORE, US DEPUTY SCIENCE EDITOR
Published: 12:35 EDT, 13 July 2026 | Updated: 16:03 EDT, 13 July 2026
A second significant earthquake has struck Southern California in two days, along a dangerous fault line that one expert claims has now been ‘unlocked’ and could soon unleash ‘The Big One.’
A magnitude 4.3 quake struck less than 90 miles from Los Angeles at 12.40pm ET (9.40am local) on Monday, according to the US Geological Survey (USGS).
It struck less than 24 hours after a magnitude 4.1 tremor erupted along the same fault line that a California geophysicist says is long overdue for a massive and devastating quake – the Garlock Fault.
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