Chance of massive San Andreas earthquake this week is disturbingly high

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A swarm of small earthquakes along the notorious San Andreas fault has increased Southern California's risk for a major one.

No one really felt the more than 200 tiny quakes that rumbled under the Salton Sea earlier this week.

Still, the California Office of Emergency Services issued an earthquake advisory for several counties, including San Diego, Los Angeles and San Bernardino. The warning extends through Oct. 4.

SEE MORE: The Moon Could Be Making Some Earthquakes Bigger

According to the Los Angeles Times, the tremors occurred in a seismic zone south of where the San Andreas fault ends.

SEE: Photos of significant earthquake damage:

10 Deadliest USA Earthquakes
See Gallery
10 Deadliest USA Earthquakes

Jan. 17, 1994: Los Angeles, California

(AP Photo/Reed Saxon, File)

Damaged Kaiser Medical Building in the Northridge Reseda area of Los Angeles after 1994 earthquake (Photo by Visions of America/UIG via Getty Images)
A car at a Mazda dealership crushed in the Los Angeles earthquake of January 17, 1994 (Photo by Visions of America/UIG via Getty Images)

1886 Charleston Earthquake 

(Photo: hdes.copeland/Flickr)

1886 Charleston Earthquake 

(Photo: hdes.copeland/Flickr)

1886 Charleston Earthquake 

(Photo: hdes.copeland/Flickr)

April 1960: Valdivia, Chile

(Photo by Keystone-France/Gamma-Keystone via Getty Images)

picture taken in April 1960 in Valdivia of people looking at an enormous crack on a street due to the earthquake that struck the area on May 22, 1960. AFP PHOTO (Photo credit should read STF/AFP/Getty Images)
Residents of Valdivia, Chile look over wrecked buildings on May 31, 1960 in the wake of earthquakes that caused widespread damage and loss of life in the South American country. (AP Photo)

October 18, 1989: San Francisco, California

(Photo by Rich Pilling/Getty Images)

A group of people stand in the South of Market street, Wednesday, Nov. 1, 1989 in San Francisco, where five people died under a torrent of bricks when the 15-second quake two weeks ago wrenched off the top of a four-storey building in San Francisco. South of Market, the second-deadliest place in the temblor and little known by outsiders. Was one of the areas hardest hit by the earthquake. (AP Photo/Eric Risberg)

August 24, 2014: Napa, California

(Photo credit Josh Edelson/AFP/Getty Images)

March 10, 1933: Long Beach, California

(Photo by Underwood Archives/Getty Images)

Damaged building exterior, damage caused by the 1933 earthquake, Long Beach, California, March 12, 1933. (Photo by Smith Collection/Gado/Getty Images)
Part of a long line of homeless earthquake victims as they wait for food rations at a relief tent set up after a series of devastating quakes, Long Beach, California, March 13, 1933. The powerful quakes began March 11 and killed 115 people and did $75,000,000 in damage. Signs on the tent read 'Free Food' and 'Food Administer.' (Photo by FPG/Getty Images)

March 29, 1964: Valdez/Anchorage, Alaska

(AP Photo)

With the city under martial law, soldiers patrol a downtown street in Anchorage, Alaska, March 28, 1964. In background is the wreckage of the five-story Penney store at Fifth Avenue and D Street. (AP Photo)
File - In this March 30, 1964 file photo, Anchorage small business owners were going full tilt clearing salvagable items and equipment from their earthquake-ravaged stores on shattered Fourth Avenue in Alaska, in the aftermath of an earthquake. North America's largest earthquake rattled Alaska 50 years ago, killing 15 people and creating a tsunami that killed 124 more from Alaska to California. The magnitude 9.2 quake hit at 5:30 p.m. on Good Friday, turning soil beneath parts of Anchorage into jelly and collapsing buildings that were not engineered to withstand the force of colliding continental plates. (AP Photo, File)

April 6, 1946: Aleutian Islands

(Photo by Keystone/Hulton Archive/Getty Images)

April 9, 1946: Hilo, Hawaii 

Homeless people are taken to emergency accommodation on US Army trucks, 9th April 1946, after a Pacific-wide tsunami hit Hilo, Hawaii. The tidal wave, on 1st April, was caused by an earthquake near the Aleutian Islands. (Photo by Keystone/Hulton Archive/Getty Images)

April 18, 1906: San Francisco, California

(AP Photo/U.S. Geological Survey)

1906: Full-length view of pedestrians examining frame houses, which lean to one side on the verge of collapse after the Great Earthquake in San Francisco, California. (Photo by Hulton Archive/Getty Images)
1906: View of a cobblestone street, which was split down the middle after the Great Earthquake in San Francisco, California. A wooden cart has fallen into the crack. (Photo by American Stock/Getty Images)

And scientists are afraid quakes in that area could one day trigger a huge earthquake. But experts say not to panic quite yet.

This week's small quakes only upped the likelihood of a major quake occurring in the coming days by up to 1 percent.

SEE MORE: Earthquakes Like The One In Oklahoma Could Be Humans' Fault

And experts say swarms like these come and go all the time without causing any large rumbles.

The U.S. Geological Survey said in a statement, "Swarm-like activity in this region has occurred in the past, so this week's activity, in and of itself, is not necessarily cause for alarm."

As one seismologist told The Desert Sun, "Most likely, nothing more will happen."

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