Qualla: Salton Sink

Salton Sink: Introduction

Wed, 01 Apr 2026 00:00:00 GMT

Stand at the edge of the Salton Sea and you are standing 269 feet below the level of the Pacific Ocean, in a depression so deep and so dry that geologists have long used it to read the Earth's internal diary. The Salton Sink is not merely a geographic low point — it is an active wound in the planet's crust, a place where the San Andreas Fault and the East Pacific Rise are methodically pulling the North American plate apart. California is, in a geological sense, coming undone here, and the Salton Sink is where the evidence is most visible.

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Salton Sink: A Basin Born of Tectonics

Wed, 01 Apr 2026 00:00:00 GMT

The Salton Sink belongs to the Salton Trough, a pull-apart basin formed where two great tectonic features intersect. The San Andreas Fault, which most people associate with earthquake risk farther north, reaches its southern terminus near the Salton Sea. The East Pacific Rise — t...

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Salton Sink: Lake Cahuilla and the Long Memory

Wed, 01 Apr 2026 00:00:00 GMT

The Salton Sink has held water many times. The most significant prehistoric lake, Lake Cahuilla, existed for roughly 17,500 years — from about 20,500 to 3,000 years before the present — fed by overflow from the Colorado River when that river's delta shifted and spilled into the b...

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Salton Sink: The Flood That Made the Sea

Wed, 01 Apr 2026 00:00:00 GMT

The Salton Sea we see today is young by any geological measure. In 1862, a massive flood sent water pouring into the sink, creating a temporary lake sixty miles long. That lake dried. Then in 1905, an irrigation canal intake near Yuma failed catastrophically, allowing the entire ...

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Salton Sink: The Youngest Volcanoes in California

Wed, 01 Apr 2026 00:00:00 GMT

At the southern end of the Salton Sea, a cluster of small mounds called the Salton Buttes rise from the surrounding flats. They are rhyolite lava domes, and they are among the youngest volcanic features in California, with the most recent eruptions dated to approximately 10,300 y...

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