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7.7 magnitude earthquake hits Southeast Asia, affecting Myanmar and Thailand

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275 points testrun | 4 comments | 28 Mar 25 09:32 UTC | HN request time: 0s | source
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v3ss0n ◴[28 Mar 25 11:40 UTC] No.43504126[source]▶
I am Myanmar and reporting from Bangkok.

I was upstairs, at third floor and was going down to have lunch and it shook whole house. At first I thought I am having nausea due to not having any food yet then thing starts to shake violently almost knocked me off stairs . And glasses started to rumble.

A construction in Pathunam collapsed.

Some house of friends of mine in Mandalay - Myanmar collapsed. One girl managed to get out in time.

One construction in Mandalay collapsed - 2 died.

Historic Mandalay Palace wall and entrance collapsed .

Airport in naypyitaw collapsed, there are report of many airport workers died.

Bridges collapsed, one of the longest standing historic bridges of Myanmar - Sagaing Bridge collapsed.

One other bridge in Mandalay brings down two cars with it, casualties unknown.

https://www.facebook.com/share/p/18bsATAEKS/

Many Junta gov buildings collapsed

https://www.facebook.com/share/p/1BYV644DmY/

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baq ◴[28 Mar 25 11:56 UTC] No.43504251[source]▶
shakemap: https://earthquake.usgs.gov/earthquakes/eventpage/us7000pn9s...

Mandalay looks to be almost exactly in the center of the worst of it...

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1. dendrite9 ◴[28 Mar 25 16:54 UTC] No.43507586[source]▶
That straight line in the map doesn't look like the maps for any earthquakes I've felt. It looks like it was on the Sagaing Fault which is a different type of fault from the ones I've experienced.

https://en.wikipedia.org/wiki/Sagaing_Fault

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2. baq ◴[28 Mar 25 17:56 UTC] No.43508258[source]▶
quoting from the 'Hazard' section:

> The length of fault running 260 km (160 mi) from 19.2°N to 21.5°N, on the Meiktila segment, is designated a seismic gap due to the absence of major earthquake ruptures since at least 1897. At least 2 m (6 ft 7 in) of slip has accumulated along the fault corresponding to a magnitude 7.9 earthquake.

Science did pretty well here with the magnitude. Wonder how much more research is needed to be able to predict an event let's say a full minute before it happens...

3. dnawy ◴[28 Mar 25 18:28 UTC] No.43508574[source]▶
2023 Turkey-Syria Earthquake has a ShakeMap similar to this event [1]; We often think of the epicenter as a single point in earth where the energy then radiates outward. In reality, a fault is more similar to line [2]. The energy radiates outward around the entire fault line.

(Note: since earthquake magnitude is correlated with the amount of area moved, it is safe to assume that larger earthquake will have larger fault rupture)

[1] https://en.wikipedia.org/wiki/2023_Turkey%E2%80%93Syria_eart... [2] https://earth-planets-space.springeropen.com/articles/10.118...

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4. SpicyUme ◴[28 Mar 25 19:23 UTC] No.43509071[source]▶
Interesting, the idea that a fault is a more of a line source makes sense it is hard for me to think of a way to have a single point source slip with enough energy. I guess I've thought in subduction faults the depth of the slip might explain why there is a point source. For example in the Pacific Northwest the earthquake from the Juan de Fuca plate look to be substantially deeper than this one. (50km vs 10km) Of course I expect the depth from today to be preliminary and be adjusted later, I can see the extent of red region in the shakemap changed to be longer from when I looked at it an hour or two ago.

Do you know if the line source model comes from having more and better seismographs or has there been a change in how people think about the motion of a fault in an earthquake?