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You are browsing the archive for earthquake Archives - Mountain Beltway.

8 September 2017

Big earthquake in southwestern Mexico, M8.1

The M8.1 southwestern Mexico earthquake is discussed and placed in context.

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27 April 2016

An opportunity to help in Canoa

As I mentioned last week, I have family in one of the coastal towns in Ecuador that was hardest hit by the magnitude 7.8 earthquake the previous weekend. Don and Wendy have asked me to share this opportunity to help: The James Dean Byrd Foundation runs a school in Canoa, La Escuela Bilingue los Algarrobos, whose campus is currently being used as a staging ground for the military’s assistance in …

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21 April 2016

Firsthand reports from Canoa, Ecuador after the quake

Callan’s mother-in-law lives in one of the most strongly-shaken regions of Ecuador. Here, she and her boyfriend recount the experience of the earthquake Saturday night and its aftermath. Includes 8 photos from the scene.

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12 February 2012

Fractures on a seismic sign

On the campus of the University of Texas at El Paso, there is a sign for the Kidd Seismic Observatory. The sign has seen some brittle deformation of its reflective letters. I infer this due be due to differential shrinkage of the letters (relative to the sign they are attached to) in the intense Texas heat. I like seeing deformation in materials other than rocks. This is a neat example …

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29 September 2011

Salt dough physiographic province map of Virginia

By local prodigy Hannah Holland, elementary school student: Click through to make it bigger and see some details. Nice work, Hannah! Very impressive, and thanks for sharing!

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13 September 2011

More earthquake damage

These are all in the northern stairwell between the 2nd and 3rd floors of the Godwin Building here on the Annandale campus of NOVA. The cement blocks have clearly separated along their mortared edges, and the disruption of the paint layer in a series of en echelon fractures reveals that deeper structural issue. I find this a bit scary. I have no information about what, if anything, is being done …

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7 September 2011

Another updated aftershock plot…

A up-to-date tally of the aftershocks from the Mineral, Virginia earthquake is presented as a time vs. magnitude plot.

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30 August 2011

Updated aftershock plot

The USGS reports more aftershocks, so your humble graphing servant has responded with a plot that updates the images I showed you last week. Here you go: Embiggable, via a simple click. Again, the “decay” pattern jumps out at us. One thing that I’m also noticing is how there are no events below 2.0 magnitude. What’s up with that? Simply not detectable? …or not worth bothering with? By the way, …

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28 August 2011

Damage to the Ecuadorian Embassy

My wife Lily is an Ecuadorian citizen. She was born in Quito, and we have traveled there together. (She’s also a U.S. citizen.) After the big earthquake on Tuesday, significant structural damage was reported at several Washington landmarks including the Washington Monument and the Smithsonian Castle. Another one, less recognizable to most folks, but key in our personal geography, is the Embassy of Ecuador. Not only is it an outpost …

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27 August 2011

Animated GIF of Virginia quake aftershocks

So last Tuesday we had an earthquake, and we expected some aftershocks as the crust in the Mineral, Virginia, area adjusted to the new stress regime. We expected those aftershocks to be lesser in magnitude, and to take place after the main shock. In other words, we would predict the following: And, indeed, over the past several days, that’s actually what happened:

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