Hidden Volcano in Southern California
Near a popular hiking trail in San Diego, there’s an often-overlooked spot that harbors a surprising secret: it’s actually an ancient volcano.
Calavera Mountain, situated within the Calavera Nature Preserve in Carlsbad, may appear to be just another hill. However, according to reports, this formation was born out of intense geological activity millions of years ago.
Even people who have lived in these quiet areas for long periods can be unaware of the ancient mysteries tucked away around them.
Chanin Franz, a hiker, shared that she only discovered this fact after her husband pointed it out. Initially, she couldn’t quite believe him until, well, she read the information herself on-site.
This volcano originated around 22 million years ago due to a collision between the North American and Pacific tectonic plates, a process termed subduction.
What you observe today is referred to as a “Plug Dome Volcano.” Visitors can see exposed sections, known as the “throat,” where hexagonal rock columns illustrate the cooling of magma.
Dr. Pat Abbott, a geologist, explained to NBC that those hexagonal columns mark the volcano’s throat. He described how, back in the day, gas propelled magma upwards, launching debris into the air until the gas diminished.
While it has erupted in the past, the volcano now lies dormant, posing no danger to visitors.
Dr. Abbott clarified that a dormant volcano can still have magma underneath. Here, though, there are no signs of magma or minor earthquakes. In his words, it’s a “dead” volcano—free from the potential to erupt again, even in the event of a significant earthquake.
Today, rather than spewing lava, the area welcomes hikers, cyclists, and families seeking nature, with scenic trails, including a 3.1-mile loop around a lake.
A local boy, Samuel Frantz, shared his delight, noting how much he enjoys the expansive space.
This preserve spans over 100 acres and provides one of North County’s more unique outdoor retreats, letting visitors tread upon volcanic debris, often without even realizing it.
