According to the United States Census Bureau, the city has a total area of 11.7 sq mi (30.4 km2), of which 8.5 sq mi (21.9 km2) is land and 3.3 sq mi (8.5 km2) (28.05%) is water. Sand deposits in the northern coastal area comprise the sole known mineral resources.

Local soil is Quaternary Alluvium. Common soil series include the Baywood fine sand on the east side, Narlon loamy sand on the west side, Sheridan coarse sandy loam on hilly terrain, and the pale Tangair sand on hills supporting closed-cone pine habitat. The city is in a moderate to high seismic risk zone, the principal threat being the active San Andreas Fault approximately 26 miles (42 km) to the east. The Monterey Bay fault, which tracks three miles (4.8 km) to the north, is also active, as is the Palo Colorado fault seven miles (11.3 km) to the south. Also nearby, minor but potentially active, are the Berwick Canyon, Seaside, Tularcitos and Chupines faults.

Following the Treaty of Guadalupe Hidalgo (February 2, 1848) that ended the war, the westernmost portion of the old Mexican territory of Alta California soon became the American state of California, and the remainder of the old territory was then subdivided into the new American Territories of Arizona, Nevada, Colorado and Utah. The lightly populated […]