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Light mag. 4.9 earthquake - 4km NE of Westmorland, CA, USA on Thursday, 1 October 2020

Light mag. 4.9 earthquake  - 4km NE of Westmorland, CA, USA on Thursday, 1 October 2020
1 Oct 00:32 UTC: First to report: USGS after 1 minutes.
1 Oct 00:34: Magnitude recalculated from 5.1 to 4.6. Hypocenter depth recalculated from 9.0 to 11.2 km (from 5.6 to 7 mi). Epicenter location corrected by 1.1 km (0.7 mi) towards W.
1 Oct 00:37: Magnitude recalculated from 4.6 to 4.9.
1 Oct 01:06: Hypocenter depth recalculated from 11.2 to 11.5 km (from 7 to 7.1 mi).
Date & time: Thursday, 1 October 2020 00:31 UTC
Local time at epicenter: 30 Sep 5:31 pm (GMT -7)
Magnitude: 4.9
Depth: 11.5 km
Epicenter latitude / longitude: 33.056°N / 115.58983°W (United States)
Nearest volcano: Salton Buttes (16 km / 10 mi)
Nearby towns and cities:
4 km (2 mi) NE of Westmorland (pop: 2,300)
10 km (6 mi) NW of Brawley (pop: 25,900)
10 km (7 mi) SW of Calipatria (pop: 7,400)
49 km (31 mi) NW of Mexicali (pop: 597,100)
146 km (91 mi) NE of Tijuana (pop: 1,376,500)
152 km (94 mi) NE of San Diego (pop: 1,394,900)
Weather at epicenter at time of quake:
Clear Sky 40.9°C (106 F), humidity: 9%, wind: 1 m/s (3 kts) from N
Primary data source: USGS
Estimated released energy: 1.4 x 1012 joules (392 megawatt hours, equivalent to 338 tons of TNT) [learn more]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
Also if you did NOT feel the quake although you were in the area, please report it! Your contribution is valuable also to earthquake science and earthquake hazard analysis and mitigation efforts. You can use your device location or the map to indicate where you were during the earthquake. Thank you!

Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
TimeMag. / DepthLocationSource
30 Sep 5:31 pm (GMT -7) (1 Oct 00:31:27 UTC)M 4.9 / 11.5 km4km NE of Westmorland, CA, USAUSGS
Thu, 1 Oct 00:31 UTCM 5.0 / 10 kmCalif.-Baja Calif. Border Region, MexicoGFZ

User reports for this quake (110)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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NAF EL CENTRO (28.2 km SSW of epicenter) [Map] / not felt / rattling, vibrating / 10-15 s : It’s my first time ever feeling a quake and it scared me cause I didn’t know what it was u til I put 2 and 2 together. It’s unnerving to say the least. | 3 users found this interesting.
70-555 Pierce st Thermal California 92274 (72.4 km NW of epicenter) [Map] / Light shaking (MMI IV) / single lateral shake / 1-2 s : I was sending a email an my chair shake hard enough to make me stop and yell at my wife earthquake and brace for more to come but it didn't happen actually I still fell like bracing from that hard shake | 2 users found this interesting. (reported through our app)
SAN DIEGO 92101 (151.9 km WSW of epicenter) [Map] / Light shaking (MMI IV) / both vertical and horizontal swinging / 10-15 s : Been in 6.4 Philippines Scariest event to frighten me. 66 years of age that was it 13 I believe at the time That one was a rolling wave.Ones felt here are splitters.up left down right. This latest was nothing.
20200829_0... .jpg (public domain)
256.5 km NNW of epicenter [Map] / Strong shaking (MMI VI) : I was sitting out doors on a chair with garage open we have a refrigerator new in garage it started to make a rattling sound it got louder and I relized we were having a earthquake i grabbed my toddler who was playing in the yard immediately. We live in covina California
Redding CA (1033.6 km NW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating : We arent very far from train tracks so when train goes by my bed shake a little. I can feel when the train is coming. But this night i was in my bed sleeping the vibrations woke me i kept waiting for the train go by and never did. I thought to my self hope we not having an earth quake But my bed vibrated for at least 15 to 20 seconds or longer. But i dident put much more thought in to it tell i read this. Wondering maybe i did feel a little after shock. But not sure if it make it this far ??? Ju
49.1 km SSE of epicenter [Map] / Moderate shaking (MMI V) : All of the furniture were moving, I was scared! | 4 users found this interesting. (reported through our app)
Westmorland CA 92281 (3.3 km SW of epicenter) [Map] / Very strong shaking (MMI VII) / 10-15 s : hit hard | One user found this interesting.
164.9 km WNW of epicenter [Map] / Weak shaking (MMI III) : My computer screen slightly shook. It wasn't a large one but it was noticeable | One user found this interesting. (reported through our app)
20200930_1... .jpg (public domain)
98.5 km NW of epicenter [Map] / Light shaking (MMI IV) : Riding the wave | One user found this interesting. (reported through our app)
735.1 km NW of epicenter [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : It woke me up from sleep
Los Angeles (285.5 km WNW of epicenter) [Map] / not felt
286.9 km WNW of epicenter [Map] / not felt : did not know any quaking happened, had just gotten in car at that time
Vista CA (152.1 km W of epicenter) [Map] / not felt : I did not feel quake
123.7 km S of epicenter [Map] / not felt
46.6 km WNW of epicenter [Map] / not felt
313.5 km WNW of epicenter [Map] / Strong shaking (MMI VI)
Fillmore CA.93015 (340.4 km WNW of epicenter) [Map] / not felt
94.1 km WNW of epicenter [Map] / not felt
San Diego (157.1 km WSW of epicenter) [Map] / not felt
Avila beach ca (530.7 km WNW of epicenter) [Map] / not felt
Mira Mesa (150.3 km WSW of epicenter) [Map] / Light shaking (MMI IV) / 5-10 s : I was washing my hands in the bathroom and the sink was shaking!
Los Angeles, CA (264.6 km WNW of epicenter) [Map] / not felt
194.1 km NW of epicenter [Map] / not felt
Gardena, 149th & Kingsley (257.1 km WNW of epicenter) [Map] / not felt
257.4 km WNW of epicenter [Map] / not felt
Rancho Cucamonga (221 km WNW of epicenter) [Map] / not felt
47.3 km SSE of epicenter [Map] / not felt
735.1 km NW of epicenter [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s : It woke me up from sleep
216 km NW of epicenter [Map] / not felt (reported through our app)
Winter haven Ca (96.3 km ESE of epicenter) [Map] / Weak shaking (MMI III) / horizontal (sideways) swinging / 1-2 s (reported through our app)
Indio, ca (94.7 km NW of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
San Luis RC, Sonora (102 km SE of epicenter) [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s
142.4 km WSW of epicenter [Map] / Light shaking (MMI IV)
tijuana (161.7 km SW of epicenter) [Map] / Very weak shaking (MMI II) / single lateral shake / 2-5 s
mexicali (84.3 km SSE of epicenter) [Map] / Very weak shaking (MMI II) / 2-5 s
83.9 km SW of epicenter [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s (reported through our app)
212.9 km WNW of epicenter [Map] / Light shaking (MMI IV)
150.2 km W of epicenter [Map] / not felt (reported through our app)
161.4 km NW of epicenter [Map] / Very weak shaking (MMI II) (reported through our app)
150 km WSW of epicenter [Map] / Very weak shaking (MMI II) / single lateral shake / 5-10 s (reported through our app)
148.5 km WSW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
306.4 km WNW of epicenter [Map] / Strong shaking (MMI VI) (reported through our app)
10.2 km SSE of epicenter [Map] / Strong shaking (MMI VI) (reported through our app)
355.7 km N of epicenter [Map] / not felt (reported through our app)
92231 / Moderate shaking (MMI V) / 20-30 s : sitting on my computer and everything around including picture frames made noise, most noticeable on chandeliers swaying 1-2 inches | 6 users found this interesting.
El Centro CA / Light shaking (MMI IV) / horizontal (sideways) swinging / 10-15 s : Felt the movement under my feet and paused , could still feel the ground swaying very smoothly. We went out our front door and saw the water in the pool splashing and saw small waves as the ground still swayed. Almost all of our neighbors we’re outside also. | 5 users found this interesting.
Mexicali, B.C. / Light shaking (MMI IV) / horizontal (sideways) swinging : Unusually long, especially the strongest part (light shaking) and then kept going very weakly for a minute or so once I left the building. | One user found this interesting.
Whitecity / not felt : Slight ground mmt. No wind and the lightest hanging wind charm haning outside on the gutter started jumping.
El Cajon 92021 / Very weak shaking (MMI II) / complex motion difficult to describe : I live in East County of San Diego California EL Cajon right near a valt line I am always feeling shemers I feel them more upstairs. This is nothing new.
Westmorland / Very strong shaking (MMI VII) : We have been feeling strong tugs and quick shakes in our home in Westmoreland ca 92281 | One user found this interesting.
Heber ,ca / Weak shaking (MMI III) / horizontal (sideways) swinging / 20-30 s : Saw my hanging keys swinging back and fourth for a good minute. | One user found this interesting.
Calexico / Strong shaking (MMI VI) / complex rolling (tilting in multiple directions) : 4.6almost feel getting out of chair | One user found this interesting.
92249 / Moderate shaking (MMI V) / single lateral shake : Oscillating movement | One user found this interesting.
Indio / not felt
What earthquake?? Los angeles, CA / not felt
Hemet / not felt : Felt it some
Los angeles / not felt
Needles, California / not felt
Santee ca / not felt
El cajon ca / Light shaking (MMI IV) : It was more of a feeling of rolling waves
Didn't feel anything / not felt
Yucaipa, Ca. / not felt
Santa Monica, California / not felt
Mission Hills / not felt
Whittier, CA / not felt
Stevenson Ranch / not felt
Yuma Arizona / Weak shaking (MMI III) / single vertical bump / 2-5 s
Los Angeles / not felt
Hesperia / not felt
Irwindale / not felt
Phelan Ca / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / very short : I just all of a sudden felt like I was feeling a rolling motion not shaking and very very lightly
Phelan Ca / Weak shaking (MMI III) / simple rolling (tilting sideways along one direction) / very short : I just all of a sudden felt like I was feeling a rolling motion not shaking and very very lightly
Salina Kansas / not felt : No
Sacramento / Very weak shaking (MMI II)
Blythe / Weak shaking (MMI III) / 10-15 s
Laughlin / not felt
Fontana CA / not felt
Pauma Valley / Very weak shaking (MMI II) / vibration and rolling / 1-2 s : Was very slight sway with hanging lights and felt few seconds of rolling as I was sitting on sofa
Escondido ca 92026 / not felt
Carlsbad / not felt : I was at Carlsbad coast...unnoticed
Anaheim, ca / not felt
Las Vegas, NV / not felt
Indio / not felt
Westmorland / Strong shaking (MMI VI)
Brawley / Light shaking (MMI IV) / single lateral shake : Me asusto. It was unexpected
Blythe, CA / Weak shaking (MMI III) / very short
Santa Ana ca / not felt
Squirrel valley ca / not felt
Lake Los Angeles Ca / not felt
Indio / not felt
Brawley / Strong shaking (MMI VI) / 2-5 s
Indio / not felt
LOS ANGELES / not felt
92281 / Very strong shaking (MMI VII)
MONTCLAIR,CA. / Very weak shaking (MMI II) / rattling, vibrating / 2-5 s
Hawthorne / Very weak shaking (MMI II) / single vertical bump / very short : I felt a thud at 5:30 p.m.
Indio ca / Very weak shaking (MMI II) / 2-5 s
92037 / not felt
Westmorland / Strong shaking (MMI VI)
San Diego / Very weak shaking (MMI II) / 2-5 s : light shake with slight chandelier sway
Indio ca / Very weak shaking (MMI II) / 2-5 s
Chula vista / Light shaking (MMI IV) / vertical swinging (up and down) / 2-5 s : Chula Vista ca
San Ysidro CA. 92173 / Light shaking (MMI IV)
MEXICALI, BAJA CALIFORNIA, MEXICO / Moderate shaking (MMI V)
TIJUANA B.C. / Light shaking (MMI IV)
Coachella / Weak shaking (MMI III) / single lateral shake / 2-5 s
Coachella, CA / not felt / horizontal (sideways) swinging / 20-30 s
Yuma Arizona / Weak shaking (MMI III) / single vertical bump / 2-5 s
Indio / Weak shaking (MMI III)
Tijuana, MX / Light shaking (MMI IV) / horizontal (sideways) swinging / 10-15 s

Earlier earthquakes in the same area since 1900

Light mag. 4.9 earthquake - 4km NE of Westmorland, CA, USA on Thursday, 1 October 2020

Map of earlier quakes

 

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