FOUR earthquakes, the strongest registering 6.9 magnitude, struck the Gulf of California off Mexico's west coast yesterday.

The tremors caused no casualties and no major damage said Carlos Valdez, head of Mexico's National Seismological Centre (SSN), which has ruled out the risk of tsunamis. 

The series of quakes began with a 5.8-magnitude tremor at 10:55 am local time, followed by one registering a magnitude of 6.9 five minutes later. 

Two more tremors, measuring 5.0 and 5.9 magnitude, followed within an hour, according to reports by the US Geological Survey (USGS), SSN and the US Tsunami Warning Centre. 

USGS said the epicentre of the strongest quake was 89 kilometres north-northeast of Santa Isabel in Baja California, Mexico, and had a depth of 10 kilometres, with a variation of plus or minus 7.1 kilometres. 

The Gulf of California is a small strip of ocean in between the Baja California peninsula and Sonora state. No damage was reported in either area.

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