California Earthquake Faults 4+

Demosthenes Pasadis

Designed for iPad

    • #115 in Weather
    • 3.0 • 2 Ratings
    • $1.99



California Earthquake Faults shows your current location or a location you search for, faults in California and approximate distances to those faults. There are 5 screens:

1. Fault Maps: Current or found location, names and distances to the closest 4 faults and a selection of 4 views:
(a) nearby faults (you can zoom into the 4 closest)
(b) faults in the San Francisco Bay Area
(c) faults in southern California
(d) faults in California
Tapping a fault will display its name.

2. Distances: Names, distances and color coding of the closest 44 (iPhone) or 70 (iPad) faults
3. Find: Find the nearest faults to a location you specify
4. App Info
5. App Settings

For a complete description, go to

Locations and distances are updated in real time so you can see how close you are to major faults when traveling.

There are many types of faults in California including: active/inactive, large/small and some that haven't been discovered yet. This app shows 115 of California's largest and most active faults. It does not show all faults.

Requires IOS 12.0 or later and an active cellular or Wi-Fi connection.
Supports these iPhones: 5s, SE, 6-8, 6-8+, X and11.
Supports these iPads: mini 2-4, Air 1-2, Gen5, 9.7" Gen6/Pro, 10.5" Pro, 12.9" Pro Gen1-2.

What’s New

Version 3.03

User interface is more consistent across tabs.

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

Ladylonghorn444 ,


Great California fault map without having to spend lots of time web-crawling and trying to navigate the convoluted USGS sites. Would like to have more backup data, though, such as type of fault, history of related earthquakes, and brief, non-scientific narrative of relative likelihood for future EQ's. if you can add hazard overlays (e.g. Liquefaction zones, tsunami threat, unstable soils, etc.), I know MANY of us living in the zones will be quick to subscribe and tell our friends and neighbors. This is a good start - keep up the good work!

AustinDale ,

Perfect tool for a realtor.

Pretty basic information every California resident should know. Wish it covered more than just California.

RTXphone ,

Very informative and easy to use!

In California everyone wants to know how far they and their relatives are from an earthquake fault. Will also be helpful when we feel the next quake.

App Privacy

The developer, Demosthenes Pasadis, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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