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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Lisa,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thanks for explaining the problem. Since the Google Maps is a
prototype app, we ask that the recenteqs on <a
href="http://ncweb-north.wr.usgs.gov/">http://ncweb-north.wr.usgs.gov/</a>,
which is a public facing server, be kept running indefinitely until we have a
satisfactory outcome of this issue. Having said that, we’re
interested in testing the Google Maps approach.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-David<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:#1F497D'>-------------------------------------------------------<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:#1F497D'>David Oppenheimer
office:650.329.4792<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:#1F497D'>U.S. Geological
Survey
fax: 650.329.4732<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Courier New";color:#1F497D'>345 Middlefield Road.-MS
977 email: oppen@usgs.gov<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:#1F497D'>Menlo Park, CA 94025</span><span style='font-family:"Arial","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
ehpweb-bounces@geohazards.usgs.gov [mailto:ehpweb-bounces@geohazards.usgs.gov] <b>On
Behalf Of </b>Lisa A Wald<br>
<b>Sent:</b> Wednesday, May 19, 2010 11:55 AM<br>
<b>To:</b> EHPweb; Dina Venezky<br>
<b>Subject:</b> [EHPweb] M<1 earthquakes<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>Earthquake Maps and Lists for M<1 events</b><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<b>Background:</b><br>
The EHP website has been listing and mapping all reent M1+ earthquakes in the
US. The N. CA website has been listing and reporting all recent M0+
earthquakes. When the Menlo website merged with the EHP website a couple
of weeks ago, the maps and lists of M<1 earthquakes were no longer
available. Subsequently, we learned that these smaller magnitude
earthquakes are monitored in specific locations by the Volcano Hazards Program
(VHP) and by the SAFOD group. I'm also aware that some of the ANSS
regional networks still have their own maps and lists on their websites because
they, too, want to see all the smaller earthquakes.<br>
<br>
<b>Critical goal:</b><br>
To restore the access to the recent maps and lists of earthquakes M<1 for
the VHP and SAFOD staff. Being able to see the map and the list at the
same time is desirable. VHP needs the caldera boundaries on the map.<br>
<br>
<b>Future goal:</b><br>
To provide access to the recent M<1 earthquakes for the entire US and
eliminate the necessity for the ANSS regional networks to run their own
maps/lists system.<br>
<br>
<b>Issues:</b><br>
The first instinct is to remove the M=1 threshold on the current recenteqs
system, but adding these on the EHP website doubles the number of earthquakes
in the system. This has several consequences:<o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>1) The addition of M<1
earthquakes on the lists will cause the lists to be extremely long in some
cases, making it difficult to see/find the larger events in the list.<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>2) Every hour all the recenteq
lists and maps are re-run to refresh the time stamp and flush events that are
older than 7 days. This is a linear operation with the list being updated
first, then the maps being recreated, and then last any new events that have come
into the system during this hourly process are added to the maps and lists.
This takes up to 5 minutes currently, and could take up to 10 minutes if
we added the M<1 events. If a new event occurred right after this
process started on the hour, it may be up to 10 minutes before it appeared on
the EHP website.<br>
<br>
3) The addition of M<1 earthquakes on the maps will obscure larger events
underneath them in some cases, making it difficult to access the information on
the larger event.<br>
<br>
Note: Since event pages are created one at a time, these can easily be created
for ALL magnitude earthquakes, allowing access to all the products for these
smaller events.<br>
<br>
<b>Proposed Solution:</b><br>
We already have an internal "proof of concept" Google map using the
M1+ RSS feed on the web development server. We can add an RSS feed of ALL
magnitude earthquakes and plot these on the Google map.<b><br>
</b><br>
<b>Tasks for completion:</b><br>
<br>
1) Turn on RSS feed for ALL earthquakes.<br>
<br>
2) Start creating event pages for ALL earthquakes.<br>
<br>
3) Obtain data for caldera boundaries.<br>
<br>
4) Modify Google map to use "clustering" ??? which will plot a marker
with the number of earthquakes it is representing in locations where the
earthquakes are close together. As you zoom in, the individual
earthquakes are individually plotted. This will speed up the rendering of
the Google map which is really slow when plotting ALL magnitude earthquakes in
the US.<br>
<br>
5) Modify list below the Google map so that events are linked to their event
pages.<br>
<br>
6) Deploy this on the master and backup servers for internal use.<br>
<br>
This is the direction we would like to go in for our future recent eq maps, so
this would provide a convenient development and testing environment for that
longer term goal. We intend to have this available sometime next week.<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";
color:black'>-<span class=apple-converted-space> </span></span><span
class=apple-style-span><span style='font-size:10.0pt'>Lisa</span></span><span
style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:black'><br>
</span><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";
color:#008500'>--------------------------<br>
</span><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";
color:#008500'>Lisa Wald, Geophysicist</span><span style='font-size:9.0pt;
font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:8.5pt;font-family:"Verdana","sans-serif";
color:#008500'>Web Team Manager<br>
USGS Earthquake Hazards Program<br>
Golden, CO<br>
303-273-8543<br>
<a href="mailto:lisa@usgs.gov">lisa@usgs.gov</a></span><span style='font-size:
9.0pt;font-family:"Verdana","sans-serif";color:black'><o:p></o:p></span></p>
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<p class=MsoNormal><span class=apple-style-span><span style='font-size:9.0pt;
font-family:"Verdana","sans-serif";color:#008500'>--------------------------</span></span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p></o:p></span></p>
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