Los Angeles Earthquake Faults Map
The above map shows fault zones in the Los Angeles Basin region. Click on faults for more information.
Faults in LA County:
San Andreas Fault Mojave Section Map
Garlock Fault Map
Sierra Madre Zone Fault Map
Whittier Fault Map
Malibu Area Fault Map
Raymond Fault Map
San Fernando Valley Fault Map
Santa Monica Area Faults
San Andreas Carrizo Plain Fault Map
Palos Verdes Area Fault Map
Newport-Inglewood Fault Map
Other Earthquake Fault Maps:
Things to check or prepare before a earthquake:
1. Check your earthquake insurance policy. Property and valuables have gone way up in value to replace. Make sure you have
enough earthquake insurance coverage.
2. Make sure you have a wrench near your gas and water values. Many companies sell aluminum wrenches
that don't weather and can be place outdoors next to your gas value.
3. Do a check of things that would most likely fall in a earthquake. Anything top heavy with a high
center of gravity will most likely fall over. Move these items to lower shelves or fasten down with
metal straps, cleats, or screws. These include Tall and thin HDTVs, bookcases, old
water heaters, things that are high on book selves like trophies, large and heavy pictures placed high.
Earthquake proofing latches on cabinets that can hold in a lot of glass and china would be a good idea. The best
earthquake latches are made by a company from Japan. They work very well.
4. Your garage is a dangerous place in a earthquake. Many garages have things placed in the rafters that can
fall. Also, a lot of flammable things like paint thinners and solvents in coffee cans are left on garage work benches with
their lids ajar or open. You should secure these items so they won't spill and cause a fire. Remember, in a
large earthquake most water mains will be broken and water won't be available after a quake.
5. Throw a old pair of tennis shoes in your car. You might have to walk home after a quake. Tennis shoes
are better to walk in than dress shoes.
6. Check your house, driveway, and garage for objects that could fall down and destroy your car. These
include chimneys, unreinforced walls, tall items, power poles/lines;etc.
7. Keep some water on hand for drinking. A few gallons for each person will keep you alive a couple of
days before the State/Feds can get bottled water in.
8. Keep a radio on hand and flashlights in each room.
9. Make a earthquake kit. A new trash can with lid is a good water tight place to store items. Things to store in it
would be tools, freeze dried meals, water bottles, cutlery, matches, enough food for your pets for a few days, toilet
paper, survival manual, work gloves, soap, first aid kit, clothes, blanket, portable radio, wrench, screw
driver, hammer, money and anything else you would need for the first 48-72 hours. Some people even buy
generators and store them in the garage for emergencies. They can keep their refrigerators, tools, and lights
running if power is out for a week or more.
10. Other good items to get before a large earthquake hits include: crank recharging lantern, a LifeStraw® for purifing pool and other water, candles, a Leatherman or Swiss Army multi-tool knife, LED flash light, crank/solar charger for your smartphone, and a Fire extinguisher.
Things to check after a quake -
1. Check family members/pets in house. If in house, call out and don't walk to them. Broken glass and items blocking
your way will be all over the house floors.
2. If it is night. Find your flashlight and shoes first before walking around. Make sure you are not in danger
before getting up. Items may have fallen in the house that could cause a threat. Example: If your house
has a large aquarium, it might have now fallen over and flooded the house cuasing a shock danger.
3. If the quake was large, check for damage. Check for gas smell first and shut off main value
if you smell gas. Check for things that are partially fallen and secure them. There will most likely be
aftershocks that will complete the task of dislodging them.
4. Be very careful opening up cabinets and your refrigerator. Many items will be broken and loose and will
fall out on you.
5. Unplug items that have fallen - TVs, stereos, microwaves, computers; etc.
6. Check for structure damage. Walls, door frames, cracks, chimneys, pool, windows, car, gas, water,
electric, phone. If your windows are cracked, you might want to tape them with duct tape to keep glass
from flying in a aftershock. If they are broken, knock out any loose glass.
7. After a large quake most cellphone and landline service will be out. Listen to a portable or car radio
for information if TV and power are out.
8. If water is still on after a quake you might want to fill water bottles and tub for water. Most
likely water mains will have broken and you will lose pressure fast.
9. Check for anything that has fallen outside. This includes power-lines and hazardous structures.
10. Check neighbors and see if they are ok. If they are not home turn off their gas. The number one
threat after a quake are fires. Most water mains will be broken and no water will be available to fight
fires. If a house near yours catches on fire, it will spread.
11. Keep freezer and refrig closed. Power will be off and items will last longer if you don't open the
12. Check your water heater and toilets. Don't use or flush them. If the water mains are broken you can
use the water in the water heater and toilet reservoir tank until they get water trucked into your area and
the mains get fixed. Pool and spa water can be used for washing water if you have access to them.
Fault Attributes Key
NAME is an 80-character field for the name of the fault (including section name,
i.e., Denali fault, Holitna section). Fault and section are lower case.
CODE is a three-integer field.that defines certainty or reliability of field mapping
(integer one), time of most recent movement (integer two), and amount or rate of slip (integer three).
CODE is composite of the single integer fields ACODE, SLIPCODE, and FCODE
and determines the line type (fault trace) to be plotted.
NUM is a six-character unique USGS identifier that defines a fault or section id. Simple fault
ids are only numeric; section ids are alpha numeric.
AGE is the upper bounding time of the most recent surface-deforming earthquake. The allowable
choices are provided in a pull-down menu.
ACODE is the second integer in CODE and defines the upper bounding time of the most recent
Permissible values are between 1 and 6: 1=historic «150 years; red =cmyk 1096680);
2= post glacial (15,000 years; orange = cmyk 1 38 1000);
3 = late Quaternary «130,000 years; green> cmyk 1002500);
4 =middle and late Quaternary «750,000 years: blue > cmyk 1004440);
5 =Quaternary «1,600,000 years; black 5);
6 = Class B (black halftone)
In the text documentation, Quaternary faults (integer two, 1-5) are Class A structures. Questionable or
suspected structures are Class B (integer two, 6).
SLIPRATE is the assigned slip rate category.
SLIPCODE is the third integer in CODE and defines the assigned slip rate category. Permissible
values are between 1 and 4 and determines line width:
1=>5 mm/year (extra wide; .048):
2 =1-5 mm/year (wide; .0325):
3 =0.2-1 mm/year (medium; .025);
4 =<.2 mm/year (thin; .015)
SLIPSENSE is normal, reverse, strike slip, thrust
DIPDIRECTION is one of the eight quadrant dip directions for the entire fault or section, not the
individual arc. C = center E =east N_ =north NE =northeast NW =northwest S =south SE =southeast SW =
southwest W_ =west
SLIPDIRECT (we are not using that field anymore and can be left empty) FCODE is the first integer
in CODE and defines how well the fault is located and expressed in the landscape. Permissible values are
between 1 and 3:
1 = fault landforms are more continuous than discontinuous and mapping is accurate at
given MAPPEDSCALE (solid);
2 = fault landforms are more discontinuous than continuous and mapping is accurate at
given MAPPEDSCALE (dashed);
3 = location of fault is inferred (dotted)
FTYPE is one of three allowable choices provided in a pull-down menu: Well constrained (FCODE 1),
Moderately constrained (FCODE 2), and Inferred (FCODE 3)
MAPPEDSCALE is one of four allowable choices provided in a pull-down menu.
Mapped scale will control visualization of the fault at various scales.
1:24,000, fault should be more continuous than discontinuous and mapping is accurate at <10,000 scale.
1:50,000, fault should be more continuous than discontinuous and mapping is accurate at <25,000 scale.
1:100,000, fault could be more discontinuous than continuous and mapping is accurate at <50,000 scale.
1:250,000, fault location may be inferred or is poorly constrained.
Click on the fault lines for more information.
Note* The earthquake faults are color coded by unique name and section not type.
Data source: USGS
CCCarto is not responsible for data errors or omissions, use as reference only.
Other Earthquake Fault Maps:
Other Web Maps:
Main Web Map Index