Surface ruptures of the Myanmar M7.7 earthquake mapped from space [SEC=OFFICIAL]

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Trevor Allen

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Apr 1, 2025, 6:20:54 PMApr 1
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Hi all,

Just starting another thread on this earthquake – the observations for the surface rupture are now available from the Sentinel satellite missions.  They confirm a rupture length of about 500 km, with maximum horizontal displacements of 4-5 m.

https://earthquakeinsights.substack.com/p/surface-ruptures-of-the-myanmar-m77

Cheers,

Trev


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Tatheer Zahra

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Apr 1, 2025, 6:47:49 PMApr 1
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like Tatheer Zahra reacted to your message:
From: aee...@googlegroups.com <aee...@googlegroups.com> on behalf of Trevor Allen <Trevor...@ga.gov.au>
Sent: Tuesday, April 1, 2025 10:20:44 PM
To: Aeesorg <aee...@googlegroups.com>
Subject: [aees] Surface ruptures of the Myanmar M7.7 earthquake mapped from space [SEC=OFFICIAL]
 
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Kevin McCue

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Apr 1, 2025, 7:58:39 PMApr 1
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There will be a huge job for someone investigating the surface ruptures. Any strong motion data likely to be shared?

Mark Edwards

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Apr 1, 2025, 8:38:53 PMApr 1
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Trev

 

It looks like a lower stress drop event for the length of rupture and Mw

 

Mark

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Trevor Allen

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Apr 2, 2025, 8:23:52 AMApr 2
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Kevin,

 

According to IRIS, there appears to be a limited strong-motion network running in Myanmar, including a station in Mandalay.  See link below for map and instrument details:

 

http://ds.iris.edu/gmap/#network=MM&planet=earth

 

Whether or not these data will become available, I’m not sure.  However, this conference abstract is somewhat promising.

Trev

Adam Pascale

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Apr 8, 2025, 2:14:47 AMApr 8
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The nearest station I can get strong motion data for, NPW at Naypyidaw, is about 2 degrees south of the epicentre but had no response data available. Assuming it’s a typical accelerograph response of 430,000 counts/m/s² then the peak acceleration at that location would have been almost 0.8g in the vertical and around 0.45g horizontally. There is no data available from the closest station at Mandalay which was only tens of kilometres from the epicentre.

Adam Pascale
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Screenshot 2025-04-08 at 1.33.45 pm.png

Kevin McCue

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Apr 8, 2025, 4:55:47 AMApr 8
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Well done Adam
It would be nice to confirm the scale. That is strong shaking as to be expected.
 Interesting that the vertical shear wave is much stronger than the horizontas and the duration surprisingly short.
Thanks for sharing
Cheers
Kevin

To view this discussion visit https://groups.google.com/d/msgid/aeesorg/7CBF0DEE-2A2F-4740-8636-F029271F1FB1%40src.com.au.


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Adam Pascale

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Apr 10, 2025, 7:22:36 AMApr 10
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The meta data has become available. Sensitivity was 318750 so peak motion was over 1g. The station location indicates it is 250km south of the origin of the rupture in Mandalay, but the fault ruptured southward towards this station (in Naypyitaw). 

When I scale up the amplitude, the big increase in signal is only 11-12 seconds after the first motion - too soon to be the S at 250km range, so something is off. I’m not familiar with the signature of super shear ruptures, so maybe it’s got something to do with that. Such high vertical acceleration for a strike slip rupture seems strange too.

Screenshot 2025-04-10 at 8.16.24 pm.pngScreenshot 2025-04-10 at 8.16.16 pm.png
On 8 Apr 2025, at 6:55 pm, Kevin McCue <mccue...@gmail.com> wrote:

Well done Adam
It would be nice to confirm the scale. That is strong shaking as to be expected.
 Interesting that the vertical shear wave is much stronger than the horizontas and the duration surprisingly short.
Thanks for sharing
Cheers
Kevin

On Tue, 8 Apr 2025 at 14:14, 'Adam Pascale' via aeesorg <aee...@googlegroups.com> wrote:
The nearest station I can get strong motion data for, NPW at Naypyidaw, is about 2 degrees south of the epicentre but had no response data available. Assuming it’s a typical accelerograph response of 430,000 counts/m/s² then the peak acceleration at that location would have been almost 0.8g in the vertical and around 0.45g horizontally. There is no data available from the closest station at Mandalay which was only tens of kilometres from the epicentre.

Adam Pascale
Find me on Bluesky, Instagram, TikTok and LinkedIn
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