Written by on . Last updated April 17th, 2024.

A shallow and significant MAG-5.6 earthquake struck in the North Pacific Ocean 173 miles from Grants Pass, The United States in the evening of Tuesday March 26th, 2024. The USGS has indicated there is a potential risk at tsunami's following this earthquake.

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Earthquake Summary

This earthquake hit under water in the North Pacific Ocean, 156 miles (252 km) off the coast of The United States, 173 miles west of Grants Pass in Oregon. The center of this earthquake had a very shallow depth of 6 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.

Date and Time: Mar 26, 2024 08:23PM (Los Angeles Time)
- Mar 27, 2024 03:23 Universal Time.
Location: 173 mi west of Grants Pass, Oregon, The United States.
Coordinates 42°18'26"N 126°43'21"W.
Map: Map of area around epicenter.
Map of area around epicenter. Click to open in Google Maps.
Magnitude: MAG 5.6
Detected by 64 stations. Maximum Error Range ±0.034 .
Depth: 6 mi (10 km)
A very shallow depth.
Max. Intensity:
IV
Light

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 under the sea. Not this earthquake.
This earthquake had a magnitude of 5.6. Earthquakes of this strength are unlikely to trigger a tsunami.
This earthquake occurred at a depth of of 6 mi (10 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 65% likelyhood of between 0 and 1 fatalities, and a 96% 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.

Roughly 70 thousand people exposed to shaking

An estimated 70 thousand have been exposed to shaking (An MMI or Modified Mercalli Intensity level II or higher) as a result of this earthquake according scientific estimates published by the USGS.

An estimated 26,920 people were exposed to level III. At this level, weak shaking and probably no damage can be expected. Intensity level II was experienced by the majority of people (around 40 thousand). In their region, very weak shaking and no damage can be expected.

People MMI Level Shaking Damage
0
I
Not noticable None
39,370
II
Very weak None
26,920
III
Weak Probably none
0
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 . Coos Bay in Oregon, The United States is the nearest significant place from the epicenter. The earthquake occurred 147 miles (236 km) west-southwest of Coos Bay. Coos Bay experienced an earthquake intensity (MMI Scale) of roughly II. That level implies very weak shaking and no damage.

A complete list of nearby places is included below. Estimated intensity data (MMI) sourced from a shake-map published by the US Geographic Survey is shown where available (cities without data probably experienced little impact).

Overview of nearby places

Distance Place Intensity (MMI)
147 mi (236 km)
ENE from epicenter
Coos Bay

Oregon, The United States.
II
Weak
165 mi (265 km)
SE from epicenter
McKinleyville

California, The United States.
168 mi (271 km)
SE from epicenter
Eureka

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

California, The United States.
171 mi (275 km)
SE from epicenter
Bayside

California, The United States.
173 mi (279 km)
E from epicenter
Grants Pass

Oregon, The United States.
183 mi (294 km)
ENE from epicenter
Roseburg

Oregon, 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 III. 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.

Shaking reported by 1 person

People that feel an earthquake may report their experience to the US Geographic Survey. Currently, 1 person has reported shaking in one place in Canada.We keep updating this article as more ground reports become available. You may report that you felt this earthquake here.

Places with most reports:

  • Sooke, British Columbia, Canada: 1 person.

3 Aftershocks detected

Since this main shock, 3 smaller aftershocks were detected. Just 3 mins after this main shock, an earthquake measuring MAG-4.7 was detected 6 mi (9 km) north-east of this earthquake.

This main shock was prefaced by 3 smaller foreshocks. A 4.5 magnitude earthquake hit 58 sec earlier nearby.

Overview of foreshocks and aftershocks

Classification Magnitude When Where
Foreshock M 3.0 7 hrs earlier
Mar 26, 2024 01:15PM (Los Angeles Time)
41 mi (67 km)
NW from Main Shock.
Foreshock M 4.0 9 mins earlier
Mar 26, 2024 08:14PM (Los Angeles Time)
5 mi (8 km)
ENE from Main Shock.
Foreshock M 4.5 58 sec earlier
Mar 26, 2024 08:22PM (Los Angeles Time)
0.5 mi (0.8 km)
NNE from Main Shock.
Main Shock
This Earthquake
M 5.6 Mar 26, 2024 08:23PM
(Los Angeles Time)
-
Aftershock M 4.7 3 mins later
Mar 26, 2024 08:25PM (Los Angeles Time)
6 mi (9 km)
NE from Main Shock.
Aftershock M 3.5 11 mins later
Mar 26, 2024 08:34PM (Los Angeles Time)
4 mi (7 km)
WSW from Main Shock.
Aftershock M 4.1 26 mins later
Mar 26, 2024 08:49PM (Los Angeles Time)
6 mi (9 km)
ENE 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?

Aftershocks are usually at least 1 order of magnitude less strong than main shocks. The more time passes, the smaller the chance and likely strength of any potential aftershocks.

The chance that a significant earthquake like this one is followed by an even larger earthquake is not so large. On average, scientists estimate a 94% chance that a major earthquake will not be followed by an even larger one. It is still adviced to be aware of this risk

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 December 20th, 2022, when a 6.4 magnitude earthquake hit 171 mi (276 km) further south-east. An even stronger magnitude 6.6 earthquake struck on December 8th, 2016.

In total, 14 earthquakes with a magnitude of 5.6 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 9 months.

Sources

Last updated 17/04/24 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 us7000m875
  2. European-Mediterranean Seismological Centre (EMSC): Earthquake 20240327_0000049
  3. Geonames.org: World Cities Database
  4. Google Maps: Static API
  5. Earthquakelist.org: Historic Earthquakes Database

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