California Department of Transportation

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Overview of Caltrans ARS Online

Using Caltrans ARS Online

1. Click on the map for lat/long, or manually enter lat/long and vs30. Then, hit the calculate button.


2. Analyze results


3. There are 5 buttons to help manipulate the results.
"View Tabular Data": Open a new window that contains result data in table forms, which can be pasted to Excel spreadsheet.


"Show Envelop Only": show the maximum values in the plot.


"Near Fault Adjustment": adjust the plot data.


"Axis Scale": Change the scale of the plot. "Log" or "Linear"


"Printer Friendly View": Opens a new window that contains map, chart, and data in plain html format.


"Basin Factor": Shows the basin factors that apply to the results.


Location Tool gives you options to search by fault name or address


Ruler tool allows you to measure a distance on the map.


Street View

Basin Overlay