Written by on . Last updated July 18th, 2024.

Under land 40 miles from Ukiah in The United States, a shallow MAG-4.3 earthquake occurred in the evening of Friday June 21st, 2024. The USGS has indicated there is a potential risk at tsunami's following this earthquake.

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Earthquake Summary

The earthquake struck on land in The United States, 40 miles (64 km) north-northwest of Ukiah in California. The center of this earthquake had a very shallow depth of 2 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.

Date and Time: Jun 21, 2024 08:46PM (Los Angeles Time)
- Jun 22, 2024 03:46 Universal Time.
Location: 40 mi NNW of Ukiah, California, The United States.
Coordinates 39°40'3"N 123°31'58"W.
Map: Map of area around epicenter.
Map of area around epicenter. Click to open in Google Maps.
Magnitude: MAG 4.3
Detected by 13 stations. Maximum Error Range ±0.2 .
Depth: 2 mi (3 km)
A very shallow depth.
Max. Intensity:
VI
Strong

On the Modified Mercalli Scale.
Tsunami Risk: Potential tsunami risk
The USGS has indicated there is a potential risk at tsunami's following this earthquake.
Always stay cautious - More info here.

Potential tsunami risk

DISCLAIMER: We strongly suggest to closely monitor advice from local authorities with regards to tsunami risks. Our analysis is based on automatically collected data from external sources, and these might contain mistakes. In addition, earthquakes can cause landslides that may lead to a tsunami, or be a followed by another, potentially stonger, earthquake.

There is a potential tsunami risk in the aftermath of this earthquake, immediately evacuate to higher grounds away from coastal areas and monitor advice from local authorities. The US Geographic Survey organization has indicated a potential risk for tsunami's following this earthquake.

Tsunami Risk Factors

Factor Under Sea? MAG-6.5 or stronger? Shallow depth?
Explanation Almost all tsunami's are caused by earthquakes with their epicenter under sea or very near the sea. However stay cautious in coastal areas as earthquakes on land may cause landslides into sea, potentially still causing a local tsunami. Under MAG 6.5: Very unlikely to cause a tsunami.
MAG 6.5 to 7.5: Destructive tsunami's do occur, but are uncommon. Likely to observe small sea level changes.
MAG 7.6+: Earthquakes with these magnitudes might produce destructive tsunami's.
Most destructive tsunami's are caused by shallow earthquakes with a depth between 0 and 100km under the surface of the earth. Deeper tsunami's are unlikely to displace to ocean floor.
This Earthquake This earthquake appears to have struck on land near a coastal area (14 mi from the sea). Not this earthquake.
This earthquake had a magnitude of 4.3. Earthquakes of this strength are unlikely to trigger a tsunami.
This earthquake occurred at a depth of of 2 mi (3 km). Earthquakes this shallow could trigger a tsunami.

Minimal impact predicted

Based on scientific estimates by the US Geographic Survey (USGS), the risk of high fatalities for this earthquake is classified at level GREEN (low). They expect an 69% likelyhood of between 0 and 1 fatalities, and a 98% chance that the number of fatalities falls no higher than 10.

The USGS classifies the economic impact of this earthquake at level GREEN (low). They expect an 65% likelyhood of between 0 and 1 million US Dollars in economic damage and impact, and a 96% chance that the economic impact of this earthquake falls no higher than 10 million USD.

Not many people felt this earthquake

The USGS has published a report estimating the number of people exposed to this earthquake. Acoording to their analysis, roughly 160 thousand have been exposed to shaking at an MMI level of II or higher.

The highest earthquake impact level for this earthquake is IV, which corresponds with light shaking and likely no damage. Roughly 2,380 people are expected to be exposed to this level. Intensity level I was experienced by the majority of people (around 6.2 million). In their region, not noticeable and no damage can be expected.

People MMI Level Shaking Damage
6,169,000
I
Not noticable None
121,100
II
Very weak None
39,830
III
Weak Probably none
2,380
IV
Light Likely none
0
V
Moderate Very light
0
VI
Strong Light
0
VII
Very Strong Moderate
0
VIII
Severe Moderate to heavy
0
IX
Violent Heavy
0
X
Extreme Very heavy

Nearby towns and cities

This earthquake may have been felt in The United States . Located 40 miles (64 km) north-northwest of the epicenter of this earthquake, Ukiah (California, The United States) is the nearest significant population center. Ukiah experienced an earthquake intensity (MMI Scale) of roughly II. That level implies very weak shaking and no damage.

Multiple large cities are in proximity of today's earthquake. San Francisco is located 144 mi to the south-southeast (intensity unknown, possibly low). San Jose is located 184 mi to the south-southeast (intensity unknown, possibly low). Sacramento is located 132 mi to the south-east and experienced an intensity of I (not noticeable, no damage).

The table below provides an overview of all places in proximity of today's earthquake. Where available, the estimated intensity on the Modified Mercalli Intensity Scale in each place is included. Places where this information is omitted likely experienced little impact.

Overview of nearby places

Distance Place Intensity (MMI)
40 mi (64 km)
SSE from epicenter
Ukiah

California, The United States.
II
Weak
69 mi (111 km)
SE from epicenter
Clearlake

California, The United States.
I
Not felt
85 mi (137 km)
NNW from epicenter
Eureka

California, The United States.
II
Weak
86 mi (138 km)
NNW from epicenter
Bayside

California, The United States.
II
Weak
86 mi (139 km)
SSE from epicenter
Windsor

California, The United States.
I
Not felt
88 mi (141 km)
NNW from epicenter
Arcata

California, The United States.
II
Weak
88 mi (141 km)
NE from epicenter
Redding

California, The United States.
I
Not felt
90 mi (145 km)
E from epicenter
Chico

California, The United States.
I
Not felt
93 mi (150 km)
NNW from epicenter
McKinleyville

California, The United States.
I
Not felt
96 mi (154 km)
SSE from epicenter
Santa Rosa

California, The United States.
I
Not felt
102 mi (164 km)
SSE from epicenter
Rohnert Park

California, The United States.
I
Not felt
102 mi (164 km)
E from epicenter
Paradise

California, The United States.
I
Not felt
106 mi (170 km)
E from epicenter
Oroville

California, The United States.
I
Not felt
109 mi (175 km)
ESE from epicenter
Yuba City

California, The United States.
I
Not felt
110 mi (177 km)
SSE from epicenter
Petaluma

California, The United States.
I
Not felt
116 mi (187 km)
SE from epicenter
Woodland

California, The United States.
I
Not felt
116 mi (187 km)
SE from epicenter
Napa

California, The United States.
I
Not felt
119 mi (192 km)
SSE from epicenter
Novato

California, The United States.
I
Not felt
123 mi (198 km)
SE from epicenter
Vacaville

California, The United States.
I
Not felt
124 mi (199 km)
SE from epicenter
Davis

California, The United States.
I
Not felt
127 mi (204 km)
SE from epicenter
Fairfield

California, The United States.
I
Not felt
128 mi (206 km)
SSE from epicenter
Vallejo

California, The United States.
I
Not felt
129 mi (207 km)
SSE from epicenter
San Rafael

California, The United States.
I
Not felt
132 mi (213 km)
SE from epicenter
Sacramento

California, The United States.
I
Not felt
135 mi (218 km)
SSE from epicenter
Richmond

California, The United States.
I
Not felt
136 mi (219 km)
ESE from epicenter
Roseville

California, The United States.
I
Not felt
137 mi (220 km)
ESE from epicenter
Arden-Arcade

California, The United States.
I
Not felt
137 mi (221 km)
ESE from epicenter
Rocklin

California, The United States.
I
Not felt
138 mi (222 km)
ESE from epicenter
Citrus Heights

California, The United States.
I
Not felt
139 mi (223 km)
ESE from epicenter
Carmichael

California, The United States.
I
Not felt
141 mi (227 km)
ESE from epicenter
Rancho Cordova

California, The United States.
I
Not felt
142 mi (228 km)
SSE from epicenter
Berkeley

California, The United States.
I
Not felt
142 mi (229 km)
SE from epicenter
Concord

California, The United States.
I
Not felt
143 mi (230 km)
SSE from epicenter
Chinatown

California, The United States.
144 mi (231 km)
ESE from epicenter
Folsom

California, The United States.
I
Not felt
144 mi (232 km)
SE from epicenter
Pittsburg

California, The United States.
I
Not felt
144 mi (232 km)
SSE from epicenter
San Francisco

California, The United States.
145 mi (233 km)
SE from epicenter
Elk Grove

California, The United States.
I
Not felt
145 mi (234 km)
SE from epicenter
Walnut Creek

California, The United States.
I
Not felt
145 mi (234 km)
SSE from epicenter
Oakland

California, The United States.
147 mi (237 km)
SSE from epicenter
Daly City

California, The United States.
148 mi (238 km)
SE from epicenter
Antioch

California, The United States.
I
Not felt
148 mi (238 km)
SSE from epicenter
Alameda

California, The United States.
153 mi (247 km)
SSE from epicenter
San Leandro

California, The United States.
158 mi (255 km)
SSE from epicenter
Hayward

California, The United States.
159 mi (256 km)
SSE from epicenter
San Mateo

California, The United States.
168 mi (271 km)
SSE from epicenter
Fremont

California, The United States.
169 mi (272 km)
SE from epicenter
Stockton

California, The United States.
I
Not felt
178 mi (287 km)
SSE from epicenter
Sunnyvale

California, The United States.
180 mi (289 km)
NNE from epicenter
Ashland

Oregon, The United States.
181 mi (292 km)
SSE from epicenter
Santa Clara

California, The United States.
184 mi (296 km)
SSE from epicenter
San Jose

California, The United States.
Cities and Towns around the epicenter of this earthquake.

Earthquake Intensity Map

The maximum intensity (MMI Scale) caused by this earthquake is V. The map below shows in which areas this earthquake was the most and least impactful. It is based on data from the US Geographic Survey.

I Not felt
II Weak
III Weak
IV Light
V Moderate
VI Strong
VII Very Strong
VIII Severe
IX Violent
X Extreme
Earthquake Intensity Map based on Shakemap Data provided by USGS.

Aftershocks detected

Since this main shock, 1 smaller aftershock was detected. A 3.6 magnitude earthquake hit 1 day later 0.4 mi (0.6 km) west-northwest of this earthquake.

Overview of foreshocks and aftershocks

Classification Magnitude When Where
Main Shock
This Earthquake
M 4.3 Jun 21, 2024 08:46PM
(Los Angeles Time)
-
Aftershock M 3.6 1 day later
Jun 23, 2024 04:38AM (Los Angeles Time)
0.4 mi (0.6 km)
WNW from Main Shock.
Detected MAG2.5+ earthquakes within within 100km (62 mi), that occurred in the three days before and after the main shock.

More earthquakes coming?

The risk of aftershocks decreases rapidly over time. Usually, aftershocks are at least one order of magnitude lower than a main shock.

It's always adviced to be cautious of the risk of a larger shock following any significant earthquake, however this risk is fairly small. There is a roughly 94 percent change that no larger main shock will follow in the days following this earthquake.

Read: How to Stay Safe during an Earthquake (cdc.gov).

Earthquakes like this happen often in the region

Earthquakes of this strength are very common in the region. This is the strongest earthquake to hit since June 8th, 2024, when a 4.5 magnitude earthquake hit 70 mi (113 km) further south-southeast. An even stronger magnitude 6.6 earthquake struck on December 8th, 2016.

In total, 92 earthquakes with a magnitude of 4.3 or higher have been registered within 300km (186 mi) of this epicenter in the past 10 years. This comes down to an average of once every month.

Sources

Last updated 18/07/24 01:38 (). As more information on this earthquake becomes available this article will be updated. This article is automatically composed based on data originating from multiple sources.

  1. US Geographic Society (USGS): Earthquake nc75025237
  2. European-Mediterranean Seismological Centre (EMSC): Earthquake 20240622_0000047
  3. Geonames.org: World Cities Database
  4. Google Maps: Static API
  5. Earthquakelist.org: Historic Earthquakes Database

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