[Sca-cooks] Chilean Earthquake (OT)
yaini0625 at yahoo.com
Sat Feb 27 14:58:06 PST 2010
We in San Diego are experiencing tidal surges... last heard it was up to 6ft. Hawaii, at 11 am Pacific time, had started to sound their alarms for coming tsunami.
Is there anything we can do to help??
Duct Tape is like the Force: It has a light side & a dark side
and it holds the universe together.
From: Daniel & Elizabeth Phelps <dephelps at embarqmail.com>
To: Cooks within the SCA <sca-cooks at lists.ansteorra.org>
Sent: Sat, February 27, 2010 8:18:19 AM
Subject: Re: [Sca-cooks] Chilean Earthquake (OT)
I wonder how Suey is doing down there? It seems to have been as large a quake or even a little stronger than the one that hit Haiti. The news report I read sounded dire.
Please note that I'm not a seismologist but a coastal geologist who dabbles in shallow marine geophysics. That being said quake magnitudes are logarithmic, http://en.wikipedia.org/wiki/Richter_magnitude_scale . The main Haitian quake was IIRC 7.0. The Chilean quake is reported to have been 8.8. It is an under statement to say that the Chilean quake was more powerful. The question is what was the apparent strength of the quake at various cities at distance from the epicenter. Such can be rather quirky. Second question, what are the strengths of the after shocks. Typically the first round of after shocks are roughly a magnitude less then the first quake, say 7.8 +/- .5 or so. Thus the first after shocks are likely to be greater than the Haitian quake. The second round of subsequent after shocks will likely to be more or less in the range of the Haitian quake, say 6.8 +/- .5. The third round of after shocks should ring in around 5.8 +/- .5.
See the pattern? This sequence does not take into account the possibility of additional quakes in the strength of the original, triggered by the original, occurring. They are in for a rather rough ride.
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