[EHPweb] FW: M<1 earthquakes

[Jeremy M Fee]

Hi David,

Is it possible to use http://ncweb-menlo.wr.usgs.gov/ instead of ncweb- 
north for this short term need?  We already planned to keep ehzmenlo  
running because it serves other web sites besides quake.

Part of the reason we merged quake was so we could shut down the old,  
unpatched servers like ehznorth.


Thanks,

Jeremy


On May 21, 2010, at 11:11 AM, David Oppenheimer wrote:

> Hi Lisa,
>
> Thanks for explaining the problem. Since the Google Maps is a  
> prototype app, we ask that the recenteqs on http://ncweb-north.wr.usgs.gov/ 
> , 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.
>
> -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
>
> From: ehpweb-bounces at geohazards.usgs.gov [mailto:ehpweb-bounces at geohazards.usgs.gov 
> ] On Behalf Of Lisa A Wald
> Sent: Wednesday, May 19, 2010 11:55 AM
> To: EHPweb; Dina Venezky
> Subject: [EHPweb] M<1 earthquakes
>
> Earthquake Maps and Lists for M<1 events
>
> Background:
> 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.
>
> Critical goal:
> 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.
>
> Future goal:
> 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.
>
> Issues:
> 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:
>
> 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.
>
> 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.
>
> 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.
>
> 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.
>
> Proposed Solution:
> 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.
>
> Tasks for completion:
>
> 1) Turn on RSS feed for ALL earthquakes.
>
> 2) Start creating event pages for ALL earthquakes.
>
> 3) Obtain data for caldera boundaries.
>
> 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.
>
> 5) Modify list below the Google map so that events are linked to  
> their event pages.
>
> 6) Deploy this on the master and backup servers for internal use.
>
> 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.
>
> - Lisa
> --------------------------
> Lisa Wald, Geophysicist
> Web Team Manager
> USGS Earthquake Hazards Program
> Golden, CO
> 303-273-8543
> lisa at usgs.gov
> --------------------------
>
> _______________________________________________
> EHPweb mailing list
> EHPweb at geohazards.usgs.gov
> https://geohazards.usgs.gov/mailman/listinfo/ehpweb