EarthBrowserEarthquake · Wednesday, September 30, 2026
Magnitude 1.3 earthquake 16 km NNW of Piru, CA
A magnitude 1.3 (micro) earthquake struck 16 km NNW of Piru, CA on Wednesday, September 30, 2026 at , at a depth of 1 km (shallow).
- Magnitude
- 1.3Micro
- Depth
- 1km · shallow
- Time
- Epicenter
- 34.55° N
118.84° W - Aftershocks so far
- 0within 250 km
- Largest aftershock
- —
40 days ago · USGS id ci41340895 · last revised
The full globe opens the 3D cross-section: the hypocenter at depth, the plate boundary and subducting slab where there is one, the aftershock sequence as it grows, and the sea floor around an offshore epicenter.
What a magnitude 1.3 means
Micro earthquakes are generally not felt and are recorded only by seismographs.
A magnitude 1.3 releases about 33 times the seismic energy of a magnitude 0.3, roughly the energy of 0 tonnes of TNT. Magnitude measures the energy released at the source; how hard the ground shook at any one place depends on distance, depth and local geology, and is reported separately as intensity.
Shallow earthquakes (under 70 km) release their energy close to the surface, so shaking is stronger and more damaging near the epicenter than for a deeper quake of the same size.
Nearby earthquakes and aftershocks
This event is part of a sequence: a larger magnitude 3.4 struck 130 km away on Sep 2, 12:37 UTC, so this is most likely one of its aftershocks.
| Time (UTC) | Magnitude | Depth | Distance | Location |
|---|---|---|---|---|
| before | 0.9 | 7 km | 171 km | 12 km ENE of Ridgecrest, CA |
| before | 1.0 | 4 km | 136 km | 11 km ENE of North Tustin, CA |
| before | 1.7 | 3 km | 136 km | 11 km ENE of North Tustin, CA |
| before | 1.5 | -1 km | 119 km | 5 km NW of Boron, CA |
| before | 1.6 | 18 km | 96 km | 3 km WSW of Paramount, CA |
| before | 1.6 | 7 km | 44 km | 3 km WSW of Sylmar, CA |
| before | 1.3 | 3 km | 182 km | 5 km NNW of Beaumont, CA |
| before | 1.1 | 16 km | 51 km | 7 km NNW of Grapevine, CA |
| before | 1.0 | 4 km | 183 km | 5 km N of Beaumont, CA |
| before | 1.1 | 3 km | 182 km | 5 km NNW of Beaumont, CA |
| before | 1.3 | 30 km | 154 km | 4 km W of Highland, CA |
| before | 1.1 | 15 km | 158 km | 20 km NE of Kernville, CA |
| before | 1.1 | 7 km | 127 km | 17 km WSW of Johannesburg, CA |
| before | 1.0 | 16 km | 205 km | 7 km NE of Cabazon, CA |
| before | 1.4 | 3 km | 128 km | 3 km SSE of Villa Park, CA |
| before | 1.1 | 17 km | 197 km | 6 km NNW of Cabazon, CA |
| before | 1.8 | 17 km | 197 km | 6 km NNW of Cabazon, CA |
| before | 1.4 | 3 km | 192 km | 11 km ENE of Coso Junction, CA |
| before | 3.1 | 3 km | 192 km | 10 km ENE of Coso Junction, CA |
| before | 1.5 | 13 km | 158 km | 5 km S of Loma Linda, CA |
| before | 1.7 | 6 km | 128 km | 16 km WSW of Johannesburg, CA |
| before | 1.6 | 5 km | 210 km | 8 km W of Templeton, CA |
| before | 1.0 | 8 km | 133 km | 8 km N of Fontana, CA |
| before | 1.2 | 13 km | 242 km | 14 km SE of Anza, CA |
| before | 1.1 | 6 km | 178 km | 10 km N of Big Bear Lake, CA |
| before | 1.4 | 7 km | 127 km | 17 km WSW of Johannesburg, CA |
| before | 1.3 | 7 km | 127 km | 17 km WSW of Johannesburg, CA |
| before | 1.2 | 6 km | 128 km | 16 km WSW of Johannesburg, CA |
| before | 1.1 | 6 km | 217 km | 12 km W of Anza, CA |
| before | 1.0 | 15 km | 210 km | 9 km WSW of Idyllwild, CA |
Frequently asked questions
How is earthquake magnitude measured?
Modern magnitudes are moment magnitudes (Mw), computed from the seismic moment: the area of the fault that slipped, how far it slipped and the rigidity of the rock. Each whole step up the scale is about 32 times more energy, so a magnitude 7 releases roughly a thousand times the energy of a magnitude 5.
What is the difference between magnitude and intensity?
Magnitude is one number for the whole earthquake, describing the energy released at the source. Intensity describes the shaking at a particular place, on the Modified Mercalli scale from I (not felt) to X+ (extreme), and falls off with distance from the epicenter.
What is an aftershock?
An aftershock is a smaller earthquake in the same area after a larger one, as the crust around the ruptured fault adjusts to the new stresses. They are most frequent in the first hours and days and fade over weeks to months, though a large mainshock can produce aftershocks for years.
Why do the magnitude and location change?
The first solution uses the nearest stations only. As recordings arrive from more seismographs around the world, USGS revises the magnitude, depth and epicenter, sometimes several times in the first hours. This page reflects the latest revision.
Where does this earthquake data come from?
From the U.S. Geological Survey’s real-time earthquake feeds, which combine the USGS National Earthquake Information Center with regional seismic networks worldwide. EarthBrowser ingests the feed every minute.