[EHPweb] FW: Earthquakes missing from new CA webpages?
David Oppenheimer
oppen at usgs.gov
Thu May 13 05:53:24 UTC 2010
The recent change to eliminate M<1 quakes from the recenteqs page is
confusing monitoring of volcanic unrest and making it difficult to monitor
seismicity in the SAFOD (see below). Moreover, it will also make it
difficult to recognize remotely triggered quakes.
I initially gave my blessings to this change, but now want to return to the
old rule of posting all quakes with M>0. If our systems cannot handle this
additional amount of earthquakes during peacetime, we've got serious
problems that we need to address.
I also think we erred by not advertising this change and soliciting
comments.
-David
-------------------------------------------------------
David Oppenheimer office:650.329.4792
U.S. Geological Survey fax: 650.329.4732
345 Middlefield Road.-MS 977 email: oppen at usgs.gov
Menlo Park, CA 94025
-----Original Message-----
From: William Ellsworth [mailto:ellsworth at usgs.gov]
Sent: Wednesday, May 12, 2010 10:12 AM
To: oppen at usgs.gov
Cc: 'Jim Luetgert'; 'Scott Haefner'
Subject: Earthquakes missing from new CA webpages?
Hi David,
In trying to track down a SAFOD earthquake this morning, I went to the new
Parkfield page
http://earthquake.usgs.gov/earthquakes/recenteqscanv/FaultMaps/Parkfield.htm
l to find its location and magnitude. Much to my surprise, it was not
there, as it was well recorded by HRSN, etc.
I next went to the NCEDC catalog search page and much to my relief found the
event:
ate Time Lat Lon Depth Mag Magt Nst Gap Clo
RMS SRC Event ID
----------------------------------------------------------------------------
------------------
2010/05/12 03:54:34.25 35.9703 -120.5547 2.88 0.74 Md 9 124 1
0.14 NCSN 71391480
Is it possible that there is a rule that prevents M < 1 events from
appearing on the Parkfield page (or all other CA pages for that matter)?
If so, it needs to be changed, as I depend on being able to find them.
Personally, I would prefer to have the old style page continue, as it
conveniently listed the events along with the map.
Thanks,
Bill
___________________________________________________________________________
William L. Ellsworth
Earthquake Science Center
U.S. Geological Survey, MS-977 Office 1-650-329-4784
345 Middlefield Road Fax 1-650-329-5143
Menlo Park, CA USA 94025 e-mail ellsworth at usgs.gov
___________________________________________________________________________
-------------------------------------------------------
David Oppenheimer office:650.329.4792
U.S. Geological Survey fax: 650.329.4732
345 Middlefield Road.-MS 977 email: oppen at usgs.gov
Menlo Park, CA 94025
From: William Ellsworth [mailto:ellsworth at usgs.gov]
Sent: Wednesday, May 12, 2010 10:24 AM
To: 'Margaret T Mangan'
Cc: 'David P Hill'; 'David R Shelly'; 'David Oppenheimer'; 'Andrew M Pitt'
Subject: RE: Mammoth Mountain seismicity update
Hi Maggie,
I made an unhappy discovery this morning that the new webpage for Parkfield
earthquakes no longer displays or lists M < 0 earthquakes. This is also be
happening for the Long Valley page and might explain why Mammoth Mountain
looks so quiet in May.
The current Long Valley map only lists 8 events, all M>= 1. I went to
http://www.ncedc.org/ncedc/catalog-search.html and did a manual search for
the past 7 days for the Long Valley map area. The search returned 27
earthquakes:
Date Time Lat Lon Depth Mag Magt Nst Gap Clo
RMS SRC Event ID
----------------------------------------------------------------------------
------------------
2010/05/06 00:50:56.71 37.6147 -119.0413 5.20 0.10 Md 10 158 1
0.03 NCSN 71388095
2010/05/06 06:02:58.43 37.6217 -119.0407 4.85 0.14 Md 9 148 1
0.04 NCSN 71388105
2010/05/06 08:56:57.91 37.6252 -119.0380 4.80 0.30 Md 12 147 1
0.04 NCSN 71387980
2010/05/06 11:46:28.03 37.6358 -118.9445 7.94 0.49 Md 10 99 2
0.03 NCSN 71388020
2010/05/06 17:55:26.79 37.6345 -119.0433 4.79 0.22 Md 11 161 1
0.04 NCSN 71388155
2010/05/07 08:00:32.32 37.6175 -119.0408 5.20 0.05 Md 13 144 1
0.04 NCSN 71388580
2010/05/07 09:29:55.53 37.6440 -118.9547 7.25 1.35 Md 32 43 3
0.06 NCSN 71388475
2010/05/07 11:20:25.77 37.9947 -118.7275 7.01 1.00 Md 7 113 3
0.04 NCSN 71388510
2010/05/08 01:34:02.72 37.6260 -119.0448 5.01 0.13 Md 9 159 1
0.04 NCSN 71388945
2010/05/08 05:24:56.09 37.6232 -119.0448 4.96 0.69 Md 11 157 1
0.04 NCSN 71389040
2010/05/08 06:18:27.33 37.6308 -119.0467 5.18 1.48 Md 24 159 1
0.04 NCSN 71389075
2010/05/08 18:56:18.65 38.2112 -118.6878 2.53 1.73 Md 7 207 17
1.87 NCSN 71389435
2010/05/09 12:57:06.77 37.6252 -119.0457 4.94 0.15 Md 8 161 1
0.03 NCSN 71390725
2010/05/09 15:32:22.21 37.5868 -118.8538 8.54 0.64 Md 17 126 2
0.07 NCSN 71390030
2010/05/09 15:34:58.32 37.5890 -118.8545 9.10 0.60 Md 18 125 2
0.08 NCSN 71390040
2010/05/09 23:55:03.16 37.6465 -118.9542 6.63 0.88 Md 19 50 3
0.05 NCSN 71390320
2010/05/10 04:38:28.59 37.6245 -119.0455 5.04 0.26 Md 13 159 1
0.05 NCSN 71390510
2010/05/10 06:05:28.32 37.6210 -119.0197 4.79 0.33 Md 17 117 1
0.05 NCSN 71390555
2010/05/10 09:49:10.46 37.6560 -118.9118 5.22 0.76 Md 17 86 1
0.05 NCSN 71390615
2010/05/10 10:11:33.19 37.6577 -118.9052 5.62 1.22 Md 27 62 0
0.06 NCSN 71390635
2010/05/11 06:30:04.44 37.6212 -119.0418 5.34 0.19 Md 8 149 1
0.03 NCSN 71391205
2010/05/12 04:12:39.32 37.6238 -118.7515 10.61 1.56 Md 20 86 8
0.04 NCSN 71391505
2010/05/12 04:51:07.49 37.6320 -118.7548 10.28 0.67 Md 13 104 7
0.06 NCSN 71391520
2010/05/12 05:04:05.07 37.6178 -119.0413 4.94 0.15 Md 12 145 1
0.04 NCSN 71391530
2010/05/12 05:15:31.93 37.6273 -119.0135 5.73 -0.07 Md 8 118 2
0.03 NCSN 71391725
2010/05/12 06:11:12.87 37.6142 -118.9225 4.78 0.44 Md 17 134 1
0.04 NCSN 71391560
2010/05/12 11:06:44.48 37.6403 -119.0468 5.87 1.01 Md 18 170 2
0.05 NCSN 71391635
Clearly, this has to be fixed. Soon!
Bill
___________________________________________________________________________
William L. Ellsworth
Earthquake Science Center
U.S. Geological Survey, MS-977 Office 1-650-329-4784
345 Middlefield Road Fax 1-650-329-5143
Menlo Park, CA USA 94025 e-mail ellsworth at usgs.gov
___________________________________________________________________________
________________________________________
From: Margaret T Mangan [mailto:mmangan at usgs.gov]
Sent: Monday, May 10, 2010 1:20 PM
To: David P Hill; David R Shelly
Cc: Bernard A Chouet; Phillip B Dawson; William Ellsworth; William C Evans;
Thomas L Murray; John C Eichelberger; Andrew M Pitt; David Oppenheimer
Subject: Mammoth Mountain seismicity update
Last week kinda quiet, but so far 2010 is comparable to upswing
characterizing the latter part of 2009
_________________________
Margaret T. Mangan, PhD
Scientist-in-Charge
Long Valley Observatory
Volcano Science Center
U.S. Geological Survey
345 Middlefield Road, MS 910
Menlo Park, CA 94025 USA
telephone: (650) 329-5738
fax: (650) 329-5203
email: mmangan at usgs.gov
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