U.S. Earthquake Faults shows your current location (or a location you specify) the closest faults in the continental United States and approximate distances to those faults.

There are 5 screens:

1. Fault Maps: A map view of the current (or found) location and the names and distances to the closest 4 faults. And a map view of the faults in the continental United States. You can zoom into the 4 closest faults.

2. Distances: Names, distances and color coding of the closest faults
3. Find: Find the nearest faults to a location you specify
4. App Info
5. App Settings

U.S. Earthquake Faults shows the vast majority of faults in the continental U.S. that the USGS classifies as "Historic" (active in last 150 years) and "Holocene to Latest Pleistocene" (active in last 15,000 years). That includes over 300 faults and 700 fault lines (some faults have multiple fault lines). It does not include faults classified as "Quaternary" (15,000 to 1,600,000 years).

All fault lines and distances are approximations. For more information, go to the app's web site ( or the USGS web site ( Thank you USGS!

Requires IOS 10.0 or later.
Supports iPhone 5-8, SE, 6s-8s, 6plus-8 plus, X, Xs, Xr and Xs Max.
Supports iPad Pro 12.9" Gen1-3, Pro 11", Pro 10.5", Pro 9.7", Air Gen1-3, iPad 5-6.

What’s New

Version 1.16

Properly utilize iPhone and iPad screens.
A few improvements and bug fixes.

Ratings and Reviews

3.5 out of 5
2 Ratings

2 Ratings ,

Needs much work

As of this review, faults are limited to the western USA. No faults in Alaska. Only the major faults have been digitized. Zooming in does not reveal more. Pretty disappointing.


Innovative Solutions
5.2 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 4+
© Innovsols Inc.


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