CyberShake Data for Asimaki Team

This page documents assembling CyberShake 22.12 data for the Asimaki Team in spring 2023.

Initial data retrieval

As an initial test, we've retrieved CyberShake Study 22.12 low-frequency RotD50 data for 6 sites (LADT, PAS, SBSM, STNI, USC, WNGC) at 6 periods (2, 3, 4, 5, 7.5, 10 sec).

Data format

The data is available as a SQLite file, downloadable here.

The SQLite database consists of two tables, CyberShake_Site_Info and IM_Data.

The CyberShake_Site_Info schema is: CyberShake_Site_Info (Site_Name TEXT, Site_Lat REAL, Site_Lon REAL, Model_Vs30 REAL, Z1_0 REAL, Z2_5 REAL)

• Site_Name: the 3-5 character CyberShake site name
• Site_Lat: the latitude of the site
• Site_Lon: the longitude of the site
• Model_Vs30: The Vs30 value, created by querying the velocity model at 1-meter increments in the range [0.5, 29.5] and taking the slowness average. Note that for CyberShake, we apply a Vs floor of 500 m/s when we generate the velocity mesh used for the simulations. Therefore, values less than 500 m/s in the model aren't "seen" by the simulations.
• Z1_0: The Z1.0 value. We determine this value by querying the model in 10-meter increments, and selecting the point at which the Vs value crosses from below 1000 m/s to above. If the value crosses more than once, we use the 2nd crossing.
• Z2_5: The Z2.5 value. As with Z1.0, we query the model in 10-meter increments and select the point where Vs crosses from below 2500 m/s to above. If there are multiple crossings, we use the 2nd crossing.