Shallow M6.1 Earthquake struck on Tuesday Night in the Philippine Sea near Hualien City (Taiwan).

Written by Earthquakelist.org on April 22nd, 2024. Last updated May 3rd, 2024.

In the Philippine Sea 28 kilometer from Hualien City, Taiwan, a shallow and strong MAG-6.1 earthquake occurred in the night of Tuesday April 23rd, 2024. The USGS has indicated there is a potential risk at tsunami's following this earthquake. Japan and China are also near its epicenter.

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Earthquake Summary

This earthquake hit under water in the Philippine Sea, right off the coast of Taiwan (6 mi offshore), 28 kilometer south of Hualien City in Hualien County. The center of this earthquake had a very shallow depth of 11 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.

Date and Time:	Apr 23, 2024 02:26 (Taipei Time) - Apr 22, 2024 18:26 Universal Time.
Location:	28 km south of Hualien City, Hualien County, Taiwan. Coordinates 23°43'27"N 121°38'26"E.
Map:	Map of area around epicenter. Click to open in Google Maps.
Magnitude:	MAG 6.1 Detected by 6 stations. Maximum Error Range ±0.059 .
Depth:	11 km (7 mi) A very shallow depth.
Max. Intensity:	VII Very 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

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

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 99% likelyhood of between 0 and 1 million US Dollars in economic damage and impact.

Roughly 24 million people exposed to shaking

An estimated 24 million 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.

The highest earthquake impact level for this earthquake is VII, which corresponds with very strong shaking and likely moderate damage. Roughly 8,390 people are expected to be exposed to this level. The majority of people (roughly 19 million) live in an area exposed to level IV, where light shaking and likely no damage is expected.

People in 3 countries have been exposed to shaking. Roughly 24 million people were exposed to shaking in Taiwan , with level VII (very strong shaking, likely moderate damage) as the highest recorded. In Japan and China, a smaller number of people were exposed.

Nearby towns and cities

This earthquake struck within proximity of multiple countries. Taiwan , Japan and China are all within 300km distance of its epicenter.

Located 28 kilometer (17 mi) south of the epicenter of this earthquake, Hualien City (Hualien County, Taiwan) is the nearest significant population center. The intensity of shaking and damage in Hualien City is estimated to be around level VI on the Modified Mercalli Intensity scale (strong shaking, probably light damage).

Multiple large cities are in proximity of today's earthquake. Taipei is located 148 km to the north and experienced an intensity of IV (light shaking, likely no damage). Hualien City is located 28 km to the north and experienced an intensity of VI (strong shaking, probably light damage). Xiamen is located 371 km to the west-northwest (intensity unknown, possibly low).

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

Earthquake Intensity Map

The graph below overlays a map of the region around the epicenter with earthquake intensity data provided by the US Geographic Survey. The highest intensity level detected for this earthquake is VII.

I Not felt

II Weak

III Weak

IV Light

V Moderate

VI Strong

VII Very Strong

VIII Severe

IX Violent

X Extreme

Shaking reported by 65 people

People that feel an earthquake may report their experience to the US Geographic Survey. Currently, 65 people have reported shaking in 23 places, all within Taiwan.We keep updating this article as more ground reports become available. You may report that you felt this earthquake here.

Places with most reports:

• Yungho, Taipei Hsien, Taiwan: 20 people.
• Taichung, Taichung Shih, Taiwan: 6 people.
• Sanchung, Taipei Hsien, Taiwan: 5 people.
• Chupei, Hsinchu Hsien, Taiwan: 4 people.
• Taoyuan, Taoyuan, Taiwan: 4 people.
• Hsintien, Taipei Hsien, Taiwan: 4 people.
• Puli, Nantou, Taiwan: 2 people.
• Shulin, Taipei Hsien, Taiwan: 2 people.
• Shalu, Taichung Hsien, Taiwan: 2 people.
• Hsinchu, Hsinchu Shih, Taiwan: 2 people.

70 Aftershocks detected

After this earthquake struck, 70 smaller aftershocks occurred. At a distance of 19 km (12 mi) northwest of this earthquake, an aftershock struck 6 mins later. It measured a magnitude of 6

This main shock was prefaced by 45 smaller foreshocks. Nearby this earthquake a foreshock struck 4 hrs earlier. It measured a magnitude of 5.8

Overview of foreshocks and aftershocks

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

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 April 3rd, 2024, when a 6.4 magnitude earthquake hit 42 km (26 mi) further north. An even stronger magnitude 7.4 earthquake struck on April 2nd, 2024.

In total, 13 earthquakes with a magnitude of 6.1 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 03/05/24 19:18 (). This article contains currently available information about the earthquake and is automatically composed. We continue to update this article up to a few days after the earthquake occurred.

1. US Geographic Society (USGS): Earthquake us6000mt0r
2. European-Mediterranean Seismological Centre (EMSC): Earthquake 20240422_0000247
3. Geonames.org: World Cities Database
4. Google Maps: Static API
5. Earthquakelist.org: Historic Earthquakes Database

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