Accessing CyberShake Database Data

To query the CyberShake database, you can use the following login information with a MySQL client:

host: focal.usc.edu user: cybershk_ro password: CyberShake2007 database: CyberShake

This username/password is read-only, so you don't need to worry about accidentally changing the database.

We have quite a few tables and quite a lot of information in the database, but there are only a few tables that you'll need to use. They are:

CyberShake_Sites - used to look up the unique site ID from the name of the site (like "LADT"). CyberShake_Runs - used to look up the unique run ID using a site ID and other run parameters (like the velocity model, broadband, etc.) Ruptures - list of ruptures from UCERF used in CyberShake, along with their magnitude, name, and probability. CyberShake_Site_Ruptures - list of ruptures used for each site, including the distance to the rupture Rupture_Variations - list of rupture variations (realizations with different hypocenters and slip distributions) for each rupture PeakAmplitudes - used to get the PSA values, given the run ID and a specific rupture, rupture variation, and period

So if you'd like to get all the PSA data for LADT for 3 seconds, you'd want to run the following query:

select P.Source_ID, P.Rupture_ID, P.Rup_Var_ID, P.IM_Value from CyberShake_Sites S, CyberShake_Runs R, PeakAmplitudes P where S.CS_Short_Name="LADT" and S.CS_Site_ID=R.Site_ID and R.Max_Frequency=10.0 and R.ERF_ID=35 and R.Status="Verified" and R.SGT_Variation_ID=5 and R.Velocity_Model_ID=1 and P.Run_ID=R.Run_ID and P.IM_Type_ID=21 order by P.IM_Value desc limit 100;

The "R.Velocity_Model_ID=1" part means CVM-S; if you want CVM-H instead, you should use "R.Velocity_Model_ID=2". The "P.IM_Type_ID=21" means 3 second period. This mapping is stored in the IM_Types table, but here are the values you'd want:

Period = 10 sec, IM_Type_ID=1 Period = 5 sec, IM_Type_ID=11 Period = 3 sec, IM_Type_ID=21 Period = 2 sec, IM_Type_ID=26 Period = 1 sec, IM_Type_ID=86 Period = 0.5 sec, IM_Type_ID=88 Period = 0.2 sec, IM_Type_ID=94 Period = 0.1 sec, IM_Type_ID=99

In this example, I have asked MySQL to order them in decreasing IM_Value, so the largest PSA values are at the top. Since the query would return about 400,000 values, I've also added the 'limit 100' so I only get the top 100 values.

If you run this query, you should get source 244, rupture 12, rupture variation 0 as your largest PSA at 3 seconds. If you wanted to learn more about this rupture, you could run the following query:

select * from Ruptures where ERF_ID=35 and Source_ID=244 and Rupture_ID=12;

You'll see it's a Puente Hills rupture, with magnitude 7.25 and probability ~1.97e-06. The probability of the rupture is divided evenly among its rupture variations.

If you wanted to get the distance from LADT to this rupture, you could run the following query:

select SR.Site_Rupture_Dist from CyberShake_Site_Ruptures SR, CyberShake_Sites S where S.CS_Short_Name="LADT" and S.CS_Site_ID=SR.CS_Site_ID and SR.ERF_ID=35 and SR.Source_ID=244 and SR.Rupture_ID=12;

This will give you the shortest distance from the site to any part of the rupture surface, in km.