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Significant Earthquake and Tsunami Events

Sixty-one (not sixty) years ago today:

 
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This is a good science source on the Myanmar-Thailand M7.7 quake:

 
Over 1600 deaths in Myanmar, and they're still trying to reach trapped people by hand.

And in Bangkok on the 28th, from one of the aftershocks --



Some knowledgeable people tweet that acceleration in the main shock -- the sideways force a structure experiences -- exceeded 1 (the downward force of gravity on the structure). They mention possible geophysical reasons for this unusual intensity, but I couldn't follow them.
 
The geologist who reposted that tweet wrote (X translation): "This is Park Origin Thonglor, a luxury apartment complex in the center of #Bangkok , #Tailandia with just over 1,100 apartments spread across three towers connected by skylights. The tallest tower stands 229m tall and was opened in 2022.

"It's worth noting that the epicenter of the 7.7 MW earthquake that caused the earthquake observed in the video originated in the center of #Myanmar , just over 1,000 km to the northwest. While the oscillation may seem alarming at first glance, it's a natural response to the epicenter's distance. It demonstrates the importance of considering seismic activity in the design of high-rise structures, especially in earthquake-prone regions."

Thread continued: "The video shows that each tower at Park Origin Thonglor oscillated at a different frequency during the earthquake. This difference in oscillation frequency caused relative movement between the towers, which could have tested the structural integrity of the bridges connecting them.While the architectural design is bold, the region's seismic activity raises questions about the viability of such structures."
 
For geonerds and curious folks -- a USGS ARCGIS story map on the Myanmar quake.
 
This is so cool!

 
X translation: "It was a night nine years ago that the Kumamoto earthquake struck. Two earthquakes of "magnitude 7" struck the area, causing houses to collapse one after another, and the number of "disaster-related deaths" was more than four times the number of direct deaths. It also became an opportunity to reconsider the use of the word "aftershock." This disaster highlighted the threat of shallow earthquakes and left many lessons."



There is a supervolcano nearby (or large caldera system, as they're sometimes called), and I was surprised to learn while researching a post on it that the magma chamber might have stopped the earthquake fault rupture and reduced the aftershocks near the volcano. (Source)
 
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