Study 17.3 Data Products

Below are data products from CyberShake Study 17.3.

Hazard Maps with 57 additional sites

Below are hazard maps produced with the 438 Study 17.3 sites and an additional 52 sites in Study 17.3b.

Basic Hazard Maps

	CCA-06	CCA-06 with sites	CCA 1D	CCA 1D with sites
2 sec RotD50	2 sec hazard map, CCA-06	2 sec hazard map, CCA-06, sites marked	2 sec hazard map, CCA 1D	2 sec hazard map, CCA 1D, sites marked
3 sec RotD50	3 sec hazard map, CCA-06	3 sec hazard map, CCA-06, sites marked	3 sec hazard map, CCA 1D	3 sec hazard map, CCA 1D, sites marked
5 sec RotD50	5 sec hazard map, CCA-06	5 sec hazard map, CCA-06, sites marked	5 sec hazard map, CCA 1D	5 sec hazard map, CCA 1D, sites marked
10 sec RotD50	10 sec hazard map, CCA-06	10 sec hazard map, CCA-06, sites marked	10 sec hazard map, CCA 1D	10 sec hazard map, CCA 1D, sites marked

Overlapping Region

Below are difference and ratio plots, comparing the Study 17.3b and the Study 15.4 results. Warm colors mean that Study 17.3b results are higher, cool are lower.

In general, the Study 17.3b results are lower. The CVM-S4.26 and CCA-06 models are similar in this region, but in Study 17.3b we do not have a GTL and we apply a minimum Vs of 900 m/s, whereas in Study 15.4 we had a GTL and the minimum Vs was 500 m/s. This likely explains the difference.

Period	Difference	Ratio
2 sec	RotD50, 2 sec difference	RotD50, 2 sec ratio
3 sec	RotD50, 3 sec difference	RotD50, 3 sec ratio
5 sec	RotD50, 5 sec difference	RotD50, 5 sec ratio
10 sec	RotD50, 10 sec difference	RotD50, 10 sec ratio

Combined Maps

These combined maps were produced by combining RotD50 results from Study 15.4 (LA, CVM-S4.26) and Study 17.3b (Central CA, CCA-06). In the small overlap region between the CCA and LA CyberShake regions, values at sites in both studies were averaged with equal weight. Additionally, these maps use the Vs30 only basemap (not Z1.0 or Z2.5). Note that the scale changes depending on the map.

2 sec	RotD50, 2 sec
3 sec	RotD50, 3 sec
5 sec	RotD50, 5 sec
10 sec	RotD50, 10 sec

NGA-2 Basemaps

	3D basemap	1D basemap	Combined 3D basemap
2 sec	2 sec CCA-06 basemap	2 sec CCA 1D basemap	2 sec combined 3D basemap
3 sec	3 sec CCA-06 basemap	3 sec CCA 1D basemap	3 sec combined 3D basemap
5 sec	5 sec CCA-06 basemap	5 sec CCA 1D basemap	5 sec combined 3D basemap
10 sec	10 sec CCA-06 basemap	10 sec CCA 1D basemap	10 sec combined 3D basemap

Hazard Maps, original sites

Below are hazard maps produced using the original 438 sites.

Basic Hazard Maps

	CCA-06	CCA-06 with sites	CCA 1D	CCA 1D with sites
2 sec RotD50	2 sec hazard map, CCA-06	2 sec hazard map, CCA-06, sites marked	2 sec hazard map, CCA 1D	2 sec hazard map, CCA 1D, sites marked
3 sec RotD50	3 sec hazard map, CCA-06	3 sec hazard map, CCA-06, sites marked	3 sec hazard map, CCA 1D	3 sec hazard map, CCA 1D, sites marked
5 sec RotD50	5 sec hazard map, CCA-06	5 sec hazard map, CCA-06, sites marked	5 sec hazard map, CCA 1D	5 sec hazard map, CCA 1D, sites marked
10 sec RotD50	10 sec hazard map, CCA-06	10 sec hazard map, CCA-06, sites marked	10 sec hazard map, CCA 1D	10 sec hazard map, CCA 1D, sites marked

Overlapping Region

Below are difference and ratio plots, comparing the Study 17.3 and the Study 15.4 results. Warm colors mean that Study 17.3 results are higher, cool are lower.

In general, the Study 17.3 results are lower. The CVM-S4.26 and CCA-06 models are similar in this region, but in Study 17.3 we do not have a GTL and we apply a minimum Vs of 900 m/s, whereas in Study 15.4 we had a GTL and the minimum Vs was 500 m/s. This likely explains the difference.

Period	Difference	Ratio
2 sec	RotD50, 2 sec difference	RotD50, 2 sec ratio
3 sec	RotD50, 3 sec difference	RotD50, 3 sec ratio
5 sec	RotD50, 5 sec difference	RotD50, 5 sec ratio
10 sec	RotD50, 10 sec difference	RotD50, 10 sec ratio

Combined Maps

These combined maps were produced by combining RotD50 results from Study 15.4 (LA, CVM-S4.26) and Study 17.3 (Central CA, CCA-06). In the small overlap region between the CCA and LA CyberShake regions, values at sites in both studies were averaged with equal weight. Additionally, these maps use the Vs30 only basemap (not Z1.0 or Z2.5). Note that the scale changes depending on the map.

2 sec	RotD50, 2 sec
3 sec	RotD50, 3 sec
5 sec	RotD50, 5 sec
10 sec	RotD50, 10 sec

NGA-2 Basemaps

	3D basemap	1D basemap
2 sec	2 sec CCA-06 basemap	2 sec CCA 1D basemap
3 sec	3 sec CCA-06 basemap	3 sec CCA 1D basemap
5 sec	5 sec CCA-06 basemap	5 sec CCA 1D basemap
10 sec	10 sec CCA-06 basemap	10 sec CCA 1D basemap

Individual Basemaps

Below are 2 second basemaps for each NGA-2 individually.

	ASK 2014	BSSA 2014	CB 2014	CY 2016
Basin Effects & Vs30	ASK 2014	BSSA 2014	CB 2014	CY 2014
Vs30 Only	ASK 2014	BSSA 2014	CB 2014	CY 2014

Ellipse Coldspot

The 'coldspot' (lower hazard) which appears around (35.2, -119.5) is due to the velocity model, likely an artifact from CVM-S4's rule-based approach. Below is a plot of Z2.5 around the hotspot:

Velocity Maps

Z1.0, CCA-06 model

Z2.5, CCA-06 model

Wills 2015 Vs30