ALERTRA
320 earthquakes globally today

Earthquakes Near Rancho Cucamonga, California 91739 Today

Live data from USGS Β· Monitoring ZIP code 91739 Updated just now

120 tiny quakes nearby. Too small to feel. Completely normal background activity.

πŸ“± Get earthquake alerts β€” download the app for real-time notifications

Recent Earthquakes Near Rancho Cucamonga, California

120 earthquakes have been recorded within 250 miles of Rancho Cucamonga, California in the past 24 hours. Alertra monitors seismic activity near ZIP code 91739 using live data from the U.S. Geological Survey (USGS), updated every 60 seconds. Whether you felt shaking or are checking if an earthquake just happened near Rancho Cucamonga, this earthquake watch dashboard provides real-time magnitude data, an interactive seismic map, and earthquake history going back 15+ years.

Earthquake Alerts for Rancho Cucamonga, California

Alertra delivers real-time earthquake alerts for Rancho Cucamonga and the surrounding 91739 area. When seismic activity is detected nearby, push notifications are sent within 60 seconds β€” no manual earthquake watch required.

Coming soon! We're working on bringing monitoring to Alertra.

πŸ“Š Earthquake Watch β€” Rancho Cucamonga

Live seismic risk assessment Β· Updated every 60 seconds from USGS

Current Threat Level
Normal
LowModerateHigh
Threat score: 17 / 100

Some seismic activity near Rancho Cucamonga. Most too small to feel.

Earthquakes nearby 120
Closest to you M0.8, 15 mi
Strongest in last 24hr M2.8, Rarely felt
Last felt M4.0+ 1 day ago
Tracking Area
Rancho Cucamonga
LIVE EARTHQUAKES
Found 120 in region
Major (6.0+)
Moderate (4.0 - 5.9)
Minor (Below 4.0)
Your Location

🌍 Recent Earthquakes Near Rancho Cucamonga

Past 24 hours within 250 miles Β· Source: USGS

Showing events within 250 miles Β· Past 24 hours Β· Source: USGS
Sort by:
MagnitudeWhat You'd FeelLocationDistanceWhen
M2.8 		Rarely felt 18 km WSW of Johannesburg, CA 81 mi 5:44 AM Details β†’
M2.6 		Rarely felt 18 km WSW of Johannesburg, CA 80 mi 6:29 PM Details β†’
M2.5 		Rarely felt 3 km SSE of Frazier Park, CA 92 mi 1:50 PM Details β†’
M2.4 		Rarely felt 18 km WSW of Johannesburg, CA 80 mi 6:54 PM Details β†’
M2.3 		Rarely felt 17 km WSW of Johannesburg, CA 82 mi 10:49 PM Details β†’
M2.2 		Rarely felt 17 km WSW of Johannesburg, CA 81 mi 5:01 PM Details β†’
M2.1 		Rarely felt 6 km SSE of Parkfield, CA 201 mi 11:51 AM Details β†’
M2.1 		Rarely felt 19 km NNE of Indio, CA 79 mi 7:04 PM Details β†’
M2.0 		Rarely felt 10 km NNW of Simmler, CA 168 mi 12:53 PM Details β†’
M2.0 		Not felt 44 km S of Rachel, Nevada 233 mi 7:05 AM Details β†’
M2.0 		Not felt 19 km WSW of Johannesburg, CA 80 mi 7:11 PM Details β†’
M1.9 		Not felt 33 km NE of Ensenada, B.C., MX 157 mi 6:42 AM Details β†’
M1.9 		Not felt 4 km ESE of Vincent, CA 39 mi 5:31 AM Details β†’
M1.8 		Not felt 6 km SE of Parkfield, CA 200 mi 11:52 AM Details β†’
M1.7 		Not felt 22 km ESE of Anza, CA 77 mi 4:56 AM Details β†’
M1.7 		Not felt 5 km NNW of Boron, CA 61 mi 11:19 PM Details β†’
M1.7 		Not felt 17 km WSW of Johannesburg, CA 81 mi 1:42 PM Details β†’
M1.6 		Not felt 18 km WSW of Johannesburg, CA 81 mi 4:57 PM Details β†’
M1.6 		Not felt 17 km WSW of Johannesburg, CA 81 mi 6:26 PM Details β†’
M1.6 		Not felt 7 km SSE of Malibu Beach, CA 67 mi 5:56 AM Details β†’
M1.6 		Not felt 17 km WSW of Johannesburg, CA 81 mi 7:59 PM Details β†’
M1.5 		Not felt 2 km SE of Frazier Park, CA 92 mi 3:56 PM Details β†’
M1.5 		Not felt 20 km ENE of Little Lake, CA 129 mi 11:25 AM Details β†’
M1.5 		Not felt 2 km WSW of Wilkerson, CA 220 mi 3:59 AM Details β†’
M1.4 		Not felt 18 km WSW of Johannesburg, CA 80 mi 7:29 PM Details β†’
M1.4 		Not felt 2 km W of Orange, CA 31 mi 12:26 AM Details β†’
M1.4 		Not felt 17 km WSW of Johannesburg, CA 81 mi 3:56 AM Details β†’
M1.3 		Not felt 18 km WSW of Johannesburg, CA 81 mi 5:59 PM Details β†’
M1.3 		Not felt 23 km ENE of San Lucas, CA 233 mi 3:44 PM Details β†’
M1.3 		Not felt 17 km WSW of Johannesburg, CA 81 mi 6:19 AM Details β†’
M1.2 		Not felt 5 km SSE of Home Gardens, CA 22 mi 6:15 PM Details β†’
M1.2 		Not felt 17 km SW of La Quinta, CA 73 mi 7:57 AM Details β†’
M1.2 		Not felt 11 km NNW of Anza, CA 58 mi 7:45 AM Details β†’
M1.2 		Not felt 18 km WSW of Johannesburg, CA 81 mi 11:04 AM Details β†’
M1.2 		Not felt 18 km WSW of Johannesburg, CA 80 mi 7:26 PM Details β†’
M1.2 		Not felt 17 km WSW of Johannesburg, CA 82 mi 10:01 PM Details β†’
M1.2 		Not felt 6 km SSE of Redlands, CA 23 mi 7:14 AM Details β†’
M1.2 		Not felt 0 km E of Loma Linda, CA 17 mi 12:07 AM Details β†’
M1.2 		Not felt 17 km WSW of Johannesburg, CA 82 mi 7:19 PM Details β†’
M1.1 		Not felt 17 km WSW of Johannesburg, CA 81 mi 5:06 PM Details β†’
M1.1 		Not felt 5 km SSE of Parkfield, CA 201 mi 12:03 PM Details β†’
M1.1 		Not felt 9 km S of Idyllwild, CA 56 mi 2:08 AM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 81 mi 7:17 PM Details β†’
M1.1 		Not felt 6 km S of Mojave, CA 69 mi 6:57 PM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 81 mi 7:35 PM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 80 mi 7:16 PM Details β†’
M1.1 		Not felt 17 km WSW of Johannesburg, CA 82 mi 7:09 PM Details β†’
M1.1 		Not felt 17 km N of Indio, CA 78 mi 2:05 AM Details β†’
M1.1 		Not felt 4 km N of Frazier Park, CA 95 mi 7:52 PM Details β†’
M1.1 		Not felt 16 km SSW of Tehachapi, CA 81 mi 7:22 PM Details β†’
M1.1 		Not felt 7 km E of Calimesa, CA 33 mi 10:06 PM Details β†’
M1.1 		Not felt 6 km E of Calimesa, CA 32 mi 5:00 PM Details β†’
M1.1 		Not felt 23 km N of Ridgecrest, CA 116 mi 11:54 AM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 81 mi 9:28 PM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 81 mi 10:23 AM Details β†’
M1.1 		Not felt 17 km WSW of Johannesburg, CA 81 mi 8:46 AM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 81 mi 10:53 PM Details β†’
M1.1 		Not felt 18 km WSW of Johannesburg, CA 81 mi 5:07 PM Details β†’
M1.1 		Not felt 2 km SSE of Frazier Park, CA 92 mi 4:16 PM Details β†’
M1.1 		Not felt 17 km WSW of Johannesburg, CA 81 mi 5:07 PM Details β†’
M1.0 		Not felt 17 km WSW of Johannesburg, CA 81 mi 8:46 PM Details β†’
M1.0 		Not felt 22 km NNW of Borrego Springs, CA 79 mi 6:31 PM Details β†’
M1.0 		Not felt 10 km N of Coso Junction, CA 138 mi 5:58 PM Details β†’
M1.0 		Not felt 18 km WSW of Johannesburg, CA 80 mi 7:18 PM Details β†’
M1.0 		Not felt 20 km E of Little Lake, CA 124 mi 5:23 PM Details β†’
M1.0 		Not felt 7 km W of Tecate, B.C., MX 120 mi 2:56 PM Details β†’
M1.0 		Not felt 17 km WSW of Johannesburg, CA 81 mi 8:33 PM Details β†’
M0.9 		Not felt 7 km WNW of Lake Elsinore, CA 34 mi 12:40 PM Details β†’
M0.9 		Not felt 17 km WSW of Johannesburg, CA 82 mi 7:25 PM Details β†’
M0.9 		Not felt 17 km WSW of Johannesburg, CA 82 mi 4:01 PM Details β†’
M0.9 		Not felt 20 km N of Searles Valley, CA 124 mi 2:34 AM Details β†’
M0.9 		Not felt 15 km NE of Little Lake, CA 129 mi 1:21 AM Details β†’
M0.9 		Not felt 6 km SSE of Redlands, CA 23 mi 7:24 AM Details β†’
M0.9 		Not felt 19 km WSW of Johannesburg, CA 81 mi 5:19 AM Details β†’
M0.9 		Not felt 17 km WSW of Johannesburg, CA 80 mi 7:18 PM Details β†’
M0.8 		Not felt 3 km NE of San Dimas, CA 15 mi 8:40 AM Details β†’
M0.8 		Not felt 7 km SSW of Redlands, CA 21 mi 8:26 AM Details β†’
M0.8 		Not felt 17 km WSW of Johannesburg, CA 81 mi 5:21 PM Details β†’
M0.8 		Not felt 3 km SSW of Redlands, CA 21 mi 6:16 AM Details β†’
M0.8 		Not felt 19 km WSW of Johannesburg, CA 81 mi 5:47 AM Details β†’
M0.8 		Not felt 4 km ENE of Llano, CA 28 mi 3:26 AM Details β†’
M0.8 		Not felt 3 km W of Redlands, CA 18 mi 2:04 PM Details β†’
M0.8 		Not felt 18 km WSW of Johannesburg, CA 81 mi 4:18 AM Details β†’
M0.8 		Not felt 15 km W of Johannesburg, CA 84 mi 7:53 AM Details β†’
M0.8 		Not felt 16 km WSW of Johannesburg, CA 81 mi 9:25 PM Details β†’
M0.8 		Not felt 20 km WNW of Progreso, B.C., MX 145 mi 4:18 AM Details β†’
M0.8 		Not felt 5 km S of Redlands, CA 22 mi 3:00 AM Details β†’
M0.7 		Not felt 12 km SW of Searles Valley, CA 106 mi 2:18 AM Details β†’
M0.7 		Not felt 23 km N of Ridgecrest, CA 116 mi 11:52 AM Details β†’
M0.7 		Not felt 11 km WSW of Niland, CA 126 mi 3:31 AM Details β†’
M0.7 		Not felt 7 km E of Calimesa, CA 33 mi 10:15 PM Details β†’
M0.7 		Not felt 19 km NNE of Indio, CA 79 mi 8:34 PM Details β†’
M0.7 		Not felt 16 km ENE of Thousand Palms, CA 76 mi 2:32 PM Details β†’
M0.7 		Not felt 3 km NW of Hemet, CA 41 mi 7:07 PM Details β†’
M0.7 		Not felt 7 km ESE of Valle Vista, CA 50 mi 5:27 AM Details β†’
M0.7 		Not felt 23 km N of Ridgecrest, CA 115 mi 11:55 AM Details β†’
M0.6 		Not felt 11 km NNE of Borrego Springs, CA 88 mi 12:55 PM Details β†’
M0.6 		Not felt 18 km SSW of Searles Valley, CA 101 mi 5:38 AM Details β†’
M0.6 		Not felt 11 km WNW of Calipatria, CA 129 mi 3:32 AM Details β†’
M0.6 		Not felt 3 km E of Running Springs, CA 25 mi 11:09 PM Details β†’
M0.6 		Not felt 19 km NNE of Indio, CA 80 mi 5:38 PM Details β†’
M0.6 		Not felt 4 km WSW of Anza, CA 63 mi 3:20 PM Details β†’
M0.6 		Not felt 15 km SW of Johannesburg, CA 77 mi 5:32 PM Details β†’
M0.5 		Not felt 7 km WSW of Anza, CA 63 mi 6:45 AM Details β†’
M0.5 		Not felt 18 km NW of Parkfield, CA 215 mi 1:36 PM Details β†’
M0.5 		Not felt 6 km SSE of Redlands, CA 23 mi 7:33 AM Details β†’
M0.5 		Not felt 20 km NNE of Indio, CA 80 mi 5:38 PM Details β†’
M0.5 		Not felt 19 km W of Searles Valley, CA 112 mi 10:59 PM Details β†’
M0.4 		Not felt 16 km E of Little Lake, CA 122 mi 4:15 AM Details β†’
M0.4 		Not felt 4 km WSW of Anza, CA 63 mi 1:08 PM Details β†’
M0.4 		Not felt 24 km N of Ridgecrest, CA 116 mi 11:56 AM Details β†’
M0.4 		Not felt 7 km WSW of Anza, CA 63 mi 7:12 AM Details β†’
M0.4 		Not felt 24 km N of Ridgecrest, CA 116 mi 11:54 AM Details β†’
M0.3 		Not felt 5 km SSE of Parkfield, CA 201 mi 12:10 PM Details β†’
M0.3 		Not felt 7 km WSW of Anza, CA 63 mi 6:18 AM Details β†’
M0.2 		Not felt 11 km SSW of Searles Valley, CA 104 mi 7:35 PM Details β†’
M0.1 		Not felt 9 km S of Idyllwild, CA 58 mi 7:49 AM Details β†’
M0.1 		Not felt 6 km WSW of Anza, CA 63 mi 4:19 PM Details β†’
M0.1 		Not felt 10 km NNW of Anza, CA 59 mi 7:49 AM Details β†’
M-0.1 		Not felt 7 km WSW of Anza, CA 63 mi 6:47 AM Details β†’

πŸ“ˆ Earthquake History β€” Rancho Cucamonga

Since 2010 Β· M2.5+ Β· 250 mi radius

Rancho Cucamonga has recorded 14,478 earthquakes of magnitude 2.5 or greater within 250 miles since 2010. The largest was a M7.1 on Jul 6, 2019, located Ridgecrest Earthquake Sequence. On average, the area experiences approximately 1231 notable seismic events per year.

M2.5+ in Past 7 Days

Wed
0
β€”
Thu
3
MAX M3.4
Fri
0
β€”
Sat
1
MAX M3.0
Sun
6
MAX M4.1
Mon
3
MAX M4.3
Tue
1
MAX M2.8
Since 2010 Β· M2.5+ Β· 250 mi

Yearly Activity Β· 14478 events

Past Week
View:
M2.5–4 (bars)
M4+ (line, right axis)
Yearly Earthquake Activity by Magnitude01k2k3k4k050100150'10'13'16'19'22'252010: 2,394 (M2.5–4), 91 (M4+)2011: 793 (M2.5–4), 32 (M4+)2012: 746 (M2.5–4), 36 (M4+)2013: 532 (M2.5–4), 18 (M4+)2014: 560 (M2.5–4), 15 (M4+)2015: 423 (M2.5–4), 12 (M4+)2016: 525 (M2.5–4), 14 (M4+)2017: 469 (M2.5–4), 6 (M4+)2018: 437 (M2.5–4), 13 (M4+)2019: 3,120 (M2.5–4), 134 (M4+)2020: 922 (M2.5–4), 37 (M4+)2021: 635 (M2.5–4), 19 (M4+)2022: 448 (M2.5–4), 17 (M4+)2023: 483 (M2.5–4), 16 (M4+)2024: 661 (M2.5–4), 36 (M4+)2025: 493 (M2.5–4), 12 (M4+)2026: 316 (M2.5–4), 13 (M4+)
Event count (bars)
Seismic energy index (line)
Yearly Seismic Energy Release01k2k3k4k020.0B40.0B60.0B'10'13'16'19'22'252010: 2,485 events, Energy: 937.9M2011: 825 events, Energy: 149.1M2012: 782 events, Energy: 3.3B2013: 550 events, Energy: 94.1M2014: 575 events, Energy: 114.8M2015: 435 events, Energy: 80.5M2016: 539 events, Energy: 147.5M2017: 475 events, Energy: 31.7M2018: 450 events, Energy: 159.3M2019: 3,254 events, Energy: 49.8B2020: 959 events, Energy: 1.1B2021: 654 events, Energy: 173.0M2022: 465 events, Energy: 2.1B2023: 499 events, Energy: 121.3M2024: 697 events, Energy: 274.9M2025: 505 events, Energy: 113.0M2026: 329 events, Energy: 77.9M
Largest Recorded
M7.1
Ridgecrest Earthquake Sequence
Jul 6, 2019
Avg Noticeable / Year
59.3
Estimated felt (MMI β‰₯ II)

Strongest Recorded Earthquakes

M7.1 Jul 6, 2019
Ridgecrest Earthquake Sequence
M6.5 May 15, 2020
Monte Cristo Range, NV Earthquake
M6.4 Jul 4, 2019
Ridgecrest Earthquake Sequence
M6.3 Dec 14, 2012
279 km SSW of Avalon, California
M6.2 Nov 22, 2022
28 km SW of Las Brisas, Mexico
M6.0 Jul 8, 2021
Antelope Valley, CA
πŸ“Š Looking for detailed historical data?

πŸ›‘οΈ Earthquake Safety β€” Rancho Cucamonga, California

What Rancho Cucamonga residents should know before, during, and after an earthquake

🏠 Step 1

Before: Secure Your Space

Bolt heavy furniture to walls. Keep an emergency kit within arm's reach of where you sleep. Know your exits.

πŸ›‘οΈ Step 2

During: Drop, Cover, Hold On

Drop to your hands and knees. Take cover under sturdy furniture. Hold on until the shaking stops. Stay away from windows.

πŸšͺ Step 3

After: Check and Evacuate

Check for injuries and damage. If you smell gas, leave immediately and call 911. Expect aftershocks.

72-Hour Emergency Kit

βœ“ 1 gallon of water per person per day
βœ“ Non-perishable food (3-day supply)
βœ“ Battery-powered NOAA weather radio
βœ“ Flashlight and extra batteries
βœ“ First aid kit
βœ“ Whistle to signal for help
βœ“ N95 dust masks
βœ“ Plastic sheeting and duct tape
βœ“ Wrench or pliers to turn off utilities
βœ“ Manual can opener

Notable US Seismic History

1994 Northridge, CA
M6.7
57 fatalities, $50B in damage. One of the costliest US natural disasters.
2011 Virginia
M5.8
Felt across 22 states. The most widely felt earthquake in US history.
2018 Anchorage, AK
M7.1
Major infrastructure damage across south-central Alaska.

πŸ“ Nearby Earthquake Monitoring

Cities near Rancho Cucamonga with live tracking

πŸ”” Get earthquake alerts for Rancho Cucamonga
Alertra monitors live data 24/7 and sends push notifications the moment a earthquake is detected near you.

🏒 About Alertra

Alertra is an earthquake monitoring platform built by a team of engineers in Arizona focused on natural disaster safety technology. We provide real-time earthquake alerts and risk assessments to help communities prepare before disaster strikes.

Alertra ingests real-time seismic data from the U.S. Geological Survey (USGS) and combines it with over 15 years of legacy earthquake records to build localized risk models for communities like Rancho Cucamonga. Our threat scores, historical trend charts, and proximity alerts are all derived from this data β€” updated every 60 seconds.

Earthquake FAQ β€” Rancho Cucamonga, California

Was there an earthquake in Rancho Cucamonga today?

120 tiny quakes nearby. Too small to feel. Completely normal background activity. This page shows all earthquakes detected within 250 miles of Rancho Cucamonga in the past 24 hours, updated every 60 seconds from USGS.

Did an earthquake just happen near Rancho Cucamonga?

Check the live earthquake table above for the most recent seismic events near 91739. Alertra detects earthquakes right now as they happen and can send you instant earthquake alerts for Rancho Cucamonga.

What is the earthquake history for Rancho Cucamonga, California?

Alertra tracks USGS seismic records going back 15+ years for the Rancho Cucamonga area. View the historical trends chart above to see yearly earthquake frequency and the largest recorded event near 91739.

How do I get earthquake alerts for Rancho Cucamonga?

Download the Alertra app to receive push notifications within 60 seconds of any earthquake detected near 91739. Alertra monitors USGS seismic data 24/7 β€” no manual earthquake watch required.

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