CVM S4 Testing

We have identified points where CVM-S4 queries are stateful, specifically in the GTL region (~100m depth). By this, we mean that if we query the same point twice, CVM-S4 (and UCVM) returns different Vp, Vs, and rho properties for each query.

To investigate this, we will run some tests to determine if all CVM-S4 regions are stateful, or only the GTL regions. We will also look at how large the differences

Search Regions

Define two search regions, one in LA Basin where CVM-S4 has a GTL define. The second in the mojave where it is CVM-S4 background model. We will discretize at ~10.0m resolution. Basedon this link: Decimal Degrees, we'll descritze at 0.0001 resolution.

LABasin GTL Region 

 34.5 -118.5
 33.5 -117.5

in KML:

<coordinates>
-117.4878354283172,33.50078334085499,0 -117.506525464026,34.49927596019899,0 -118.4974992809605,34.49415374897883,0 -118.4984281529209,33.50753106210945,0 -117.4878354283172,33.50078334085499,0 
</coordinates>

Background Region

35.5 -117.5
34.4 -116.5

<coordinates>
-116.5009162254955,34.50477958412391,0 -116.5031773420153,35.49513073811349,0 -117.498189162515,35.50401461257112,0 -117.4987935697126,34.50294855960493,0 -116.5009162254955,34.50477958412391,0 
</coordinates>