May 25, 2020, 07:08:31 am

A new first for me

Started by Holding Pattern, April 01, 2020, 12:10:59 am

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PHall

Google the movie title Tremors and be enlightened.
It's not like you're super busy these days.

JC004

Quote from: PHall on April 03, 2020, 02:52:24 amGoogle the movie title Tremors and be enlightened.
It's not like you're super busy these days.

Hey, I'm county emergency services.  :-P  But I will at some point.

My late fiancee and I had an active volcano and tornado on our to-do list.  ORM?  HA! 

SarDragon

At 1853 PDT, there was a 4.9 quake, 56 miles from me. Rumble, jiggle. No big thang.
Dave Bowles
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ßτε

Quote from: SarDragon on April 04, 2020, 02:28:44 amAt 1853 PDT, there was a 4.9 quake, 56 miles from me. Rumble, jiggle. No big thang.
I felt it, too. Are we supposed to fill out a form or something?

PHall

I felt it too up in Riverside. Right in the middle of a Encampment call on Teams.
Our cadet commander who is a geology major thought it was cool.
She's originally from Minnesota where the ground doesn't move too much.

PHall

Quote from: ßτε on April 04, 2020, 03:09:48 am
Quote from: SarDragon on April 04, 2020, 02:28:44 amAt 1853 PDT, there was a 4.9 quake, 56 miles from me. Rumble, jiggle. No big thang.
I felt it, too. Are we supposed to fill out a form or something?

If you have the MyShake app on your phone you can fill out a I felt it report.

Spam

MyShake. Wow, that's fascinating. 200K downloads worldwide already.

After spending some time strolling down that alley of the internet, I get that its half app to give warning, and half to crowd source seismic data. I still have to wonder how they expect to validate actual field acceleration data given the variability of the dampening function of the human body, coupled with the variability of where the phone may be during the event (hand held, hip pocket, purse... a huge delta). The natural freq of the human body can range from 8 - 12 Hz, alone! When you add in the cushioning of having it on a nice padded hip, or in a swaying hand, or in a purse... seems the data would be near useless without characterization of the anthropometry.

I did read through the below article (and several others off researchgate, etc.), but the discussion of IRQ/ZC processing didn't seem to account for these factors, even though they did a hardware accelerometer baseline, and gave a (very) brief mention of their neural network design approach.

https://advances.sciencemag.org/content/2/2/e1501055
Ref: Research Article
EARTH SCIENCES
"MyShake: A smartphone seismic network for earthquake early warning and beyond"
    Qingkai Kong, Richard M. Allen, Louis Schreier and Young-Woo Kwon12 Feb 2016: Vol. 2, no. 2, e1501055 DOI: 10.1126/sciadv.1501055

So, with the deep talent pool we seem to have here on CT, does anyone have any experience with the system, or any thoughts on how they might have addressed this?

V/r
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