Aardbevingen #22

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Very strong M6.9 earthquake hits Tonga

A very strong earthquake, registered by the USGS as M6.9, hit Tonga at 23:29 UTC on August 25, 2024. The agency reports a depth of 106.7 km (66.3 miles). EMSC is reporting M6.9 at a depth of 102 km (63.4 miles). The quake was followed by an M6.1 at the same depth just one minute later.

The epicenter was located 72.2 km (44.9 miles) W of Pangai (population 1 738) and 154.7 km (96.1 miles) N of Nuku’alofa (population 22 400).
6 000 people are estimated to have felt very strong shaking, 98 000 strong, and 3 000 moderate.

Based on all available data, NWS PTWC said there was no tsunami threat from this earthquake.

The USGS issued a Green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.

Overall, the population in this region resides in structures that are highly vulnerable to earthquake shaking, though some resistant structures exist. The predominant vulnerable building types are unknown/miscellaneous types and wood construction.

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Tsunami-waarschuwing voor Japan na aardbeving nabij Torishima-eiland
Japan heeft een tsunamiwaarschuwing afgegeven aan inwoners van de eilanden Izu en Ogasawara. De waarschuwing volgde op een aardbeving met een kracht van 5,9 op de schaal van Richter die dinsdagochtend (plaatselijke tijd) plaatsvond op een diepte van 10 km in de Stille Oceaan nabij Torishima-eiland.

Volgens het Meteorologisch Agentschap moeten de bewoners van de twee eilanden, zo'n 600 km ten zuiden van Tokio, rekening houden met golven die tot één meter hoog kunnen worden. Inwoners krijgen het advies om ver weg bij de kustlijn te blijven. Bewoners van de regio verklaarden aan de Japanse omroep NHK dat ze de aardbeving niet hebben gevoeld.

Japan ligt op het kruispunt van verschillende tektonische platen langs de Pacifische Ring van Vuur. Het is een van de landen met de meeste seismische activiteit ter wereld. De archipel telt zo’n 125 miljoen inwoners en wordt jaarlijks getroffen door ongeveer 1.500 bevingen, waarvan de meeste van geringe sterkte zijn.

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Op woensdag 16 oktober 2024 10:06 schreef Frutsel het volgende:
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Naschok van
WKN / Twee zware (7+) aardbevingen treffen Turkije en Syrie: 50000+ doden

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Op dinsdag 10 december 2024 01:24 schreef Houtenbeen het volgende:
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5.8 in Nevada/California

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Earthquake swarm near New Madrid, Missouri

A series of earthquakes struck near the New Madrid Fault Line in southeastern Missouri on December 9, 2024, with the strongest registering M3.0 at 06:27 UTC (12:27 local time), according to the U.S. Geological Survey (USGS). This region, known as the New Madrid Seismic Zone, is the most seismically active area in the United States east of the Rocky Mountains.

Earthquake swarm near New Madrid Fault line, Missouri on December 9, 2024. Image credit: TW/SAM, Google

The sequence started at 06:00 UTC (00:00 LT) on December 9 with an M2.0 quake at a depth of 12.2 km (7.6 miles), located 6 km (3.7 miles) ESE of Hayward (population 131).

M2.2 was registered just 8 minutes later about 8 km (5 miles) ESE of Matthews (population 628), at a depth of 19.2 km (12 miles).

The strongest of the sequence, an M3.0 earthquake, struck near Howardville (population 367) at 06:27 UTC (00:27 LT) at a depth of 7.8 km (4.8 miles).

M2.1, M1.8, and M1.9 were registered by 12:25 UTC, followed by the final earthquake at 13:30 UTC (07:30 LT) — an M2.2 near Marston (population 477), Missouri at a depth of 8.4 km (5.2 miles).

The New Madrid Seismic Zone is one of the most seismically active regions in North America east of the Rocky Mountains. However, such swarms are not uncommon in this area and do not necessarily indicate an impending larger earthquake.

They are typically characterized by clusters of small to moderate earthquakes occurring over a short period. They often result from the gradual release of tectonic stress along fault lines or changes in subsurface conditions, such as fluid movement within the Earth’s crust.

While the New Madrid Seismic Zone has historically produced some of the most powerful earthquakes in the United States, modern monitoring has shown that smaller swarms are relatively frequent.

The zone produced 3 massive earthquakes, estimated to have been between M7.0 and M8.0, from 1811 to 1812. The events caused widespread destruction and were felt as far as Cincinnati, Ohio; Charleston, South Carolina; and New Orleans, Louisiana.

Earthquakes here occur on a complex network of faults within the Reelfoot Rift, an ancient geological feature that formed approximately 500 million years ago. The faults are buried beneath layers of sediment, making seismic activity difficult to predict.