Cathryn,

I don't think it has been precisely determined where the epi-center of the 1892 quake was. There is still evidence of it though. There is still a visible displacement along the Cocopah Mountains and Volcano Lake. From what I have read the quake was clearly a 7+, posssibly an 8 magnitude. It did set off some volcanics, which were taking place off and on in the region. I'll paste a short segment of a link to the history of the area. It's a long article...for a rainy night..

Glen

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"On the night of February 23, 1892, a severe earthquake occurred which was felt very strongly from San Quintín to Los Angeles and was also reported as far away as Santa Barbara, Visalia and Needles. Two weeks later, a flurry of mud volcano reports appeared in newsprint. A group of miners felt the earthquake while encamped

"on the lower Laguna Mountains, about midway between San Diego and Yuma, and very close to the Mexican boundary line. When the earthquake occurred, it was felt pretty sharp out there, and as some of us knew something about the country, the first thing we looked for next morning was a sign of a volcano over in the direction of the Cocopah region. But not a sign did we see. On the contrary, the smoke and haze of steam and vapor which had always been seen in that direction had disappeared, and the entire desert was as clear as a mirror. But all that day, rumblings continued and, toward night, a change came. Before night, we could see black smoke, and, two or three hours after dark, we could plainly see a burst of flames. The fires appeared to be about forty miles away from where we were. They were some distance below the Mexican line and over toward the Colorado river, and were evidently in the Cocopah region, where it is well known the mud volcanoes have long existed. The flames were not high in the air, but were close to the level of the desert and seemed to come from pit holes, rather than from mountain tops."

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I'll try the link...

• Mud Pots