Here are a couple of articles about the geology of the San joaquine Valley in California where the 4.9 earthquake occured 4 miles SSW of Wasco , CA.
Geologic HistoryThe San Joaquin Valley is a sediment-filled depression, called a basin, that is bound to the west by the California Coast Ranges, and to the east by the Sierra Nevadas. It is classified as a forearc basin, which basically means that it is a basin that formed in front of a mountain range.
The full article is here: [
link to www.sjvgeology.org]
The San Joaquin Valley Oil IndustryExcept for a couple of mediocre wells on the "westside" of the
San Joaquin Valley, and a few tar mining operations, farming was the mainstay of the valley in the late 1800s. However, the 1899 discovery of "black gold" in a shallow hand-dug oil well on the west bank of the Kern River changed all that. The Kern River discovery started an oil boom, and a forest of wooden derricks sprang up overnight on the flood plain just north of Bakersfield, a sleepy farm town known to most as "Bakers Swamp". Soon Kern River production accounted for 7 out of every 10 barrels of oil that came from California, and Kern River field by 1903 had made California the top oil-producing state in the country.
The full article is here: [
link to www.sjvgeology.org]
Notice that the valley is old marine sediment. They use steam injection wells to heat the oil production zones if needed.
The area where the earthquake occurred is farm land and not a concentrated oil production area.
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