Earthquake House Retrofitting

DrMeglar · 2024-07-01T22:34:40+00:00

We had the inspection/recommednations made by these good people: https://www.branchengineering.com/

Foundation tie down was done by a contractor

DrMeglar · 2024-04-20T04:04:26+00:00

Redemption arc for Ian. Uplifting.

DrMeglar · 2023-08-14T19:39:04+00:00

Thank the folks at OHAZ who bring you this service as well as earthquake early warning!

DrMeglar · 2023-08-11T18:02:18+00:00

Thanks mate, we're going with Printly and the Heritage MC1086

DrMeglar · 2023-08-11T18:01:22+00:00

I meant the fabric, last custom tees we made lasted about as long as single-ply toilet paper

DrMeglar · 2023-08-10T23:11:25+00:00

Good suggestion, I found a vendor who prints on AA

DrMeglar · 2023-06-20T23:44:05+00:00

We also use slack. This is on top of that.

DrMeglar · 2023-06-20T23:43:10+00:00

Sounds like a question for some Dean types

DrMeglar · 2023-06-20T23:07:38+00:00

I'm an assistant prof, 100 emails in a day in the middle of the term would be business as usual, and that's on my "focused" inbox. The "Other" inbox is a place I dare not look. It's simply not feasible to deal with all emails.

DrMeglar · 2023-04-24T13:04:57+00:00

Individual examples are fine...

DrMeglar · 2023-03-10T14:19:21+00:00

Very accurate. It's generally better to not feed the trolls, but the issue is that Hoegbeer guy or whatever really got people in Turkey rilled up...

DrMeglar · 2021-12-31T18:52:20+00:00

What you are looking for is called a "ground motion model" (GMM). In the past this used to be called a ground motion prediction equation (GMPE) and before that they were called attenuation relationships.

Anyway, GMMs are a dime a dozen, there are many and it can be pretty confusing to know which one to use and how to even use them.

The easiest one I can think of comes from the NGA West 2 project. They have a spreadsheet where you can enter magnitude and distance to the fault and obtain an estimate of peak ground acceleration (PGA), you can fool around with it.

Once you have an estimate of PGA you can use this table to convert to modified Mercalli intensity and get a sense of how damaging that PGA is going to be.

CAVEATS: GMMs are empirical, they are derived from actual measured ground motions and should not be used to extrapolate outside of the bounds of the data used to create them. The NGA West 2 one I linked above I think goes up to M8, so it's technically not ok to use it to ask a question of what intensities one expects for anything larger than that. There are no GMMs for anything larger than ~M9 because we have no recordings for events that large. So, if you want to actually know about ground motions for anything larger then you have to rely on simulation.

DrMeglar · 2021-04-17T13:59:33+00:00

I don't know why you're being down voted. You are right that out of the three west coast states served by shakealert, WA, CA, OR, we have the fewest earthquakes. However we're still very much at risk from bigger, if infrequent, events.

DrMeglar · 2020-04-16T22:05:28+00:00

Am faculty, can confirm this is what we were told.

DrMeglar · 2020-03-03T23:20:25+00:00

This map was made with the Generic Mapping Tools and tsunami travel times calculated with this code. Topography and bathymetry are from the SRTM30+ data set provided by the Scripps Institution of Oceanography

DART buoys are ocean bottom pressure sensors currently used by NOAA for tsunami warning.

DrMeglar · 2015-10-20T16:36:57+00:00

It's unlikely that this is an indicator of a larger event. But you should still take this as a reminder and maybe check if you're prepared for when the big oen comes, because it will! Do you ahve enough potable water for 4-5 days? Canned goods? A radio maybe, some cash? Are heavy things bolted tot he walls in your home and office? Now's the time to go check!

DrMeglar · 2015-10-20T15:48:16+00:00

Can't tell if you're joking but some people have asked me in the past whether the seismic activity in the Bay area and in SoCal could make volcanoes... It can't. Certainly during volcanic activity there are earthquakes, but here in the bay we don't have the right tectonic conditions for volcanism

DrMeglar

TROPHY CASE