### Systematic comparisons between PRISM version 1.0.0, BAP, and CSMIP ground-motion processing

By: Erol Kalkan**Christopher Stephens

                            https://doi.org/10.3133/ofr20171020

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#### Abstract

First posted February 23, 2017

**For additional information, contact:**
Earthquake Science Center—Menlo Park, Calif. OfficeU.S. Geological Survey 345 Middlefield Road, MS 977 Menlo Park, CA 94025 http://earthquake.usgs.gov/

A series of benchmark tests was run by comparing results of the Processing and Review Interface for Strong Motion data (PRISM) software version 1.0.0 to Basic Strong-Motion Accelerogram Processing Software (BAP; Converse and Brady, 1992), and to California Strong Motion Instrumentation Program (CSMIP) processing (Shakal and others, 2003, 2004). These tests were performed by using the MatLAB implementation of PRISM, which is equivalent to its public release version in Java language. Systematic comparisons were made in time and frequency domains of records processed in PRISM and BAP, and in CSMIP, by using a set of representative input motions with varying resolutions, frequency content, and amplitudes. Although the details of strong-motion records vary among the processing procedures, there are only minor differences among the waveforms for each component and within the frequency passband common to these procedures. A comprehensive statistical evaluation considering more than 1,800 ground-motion components demonstrates that differences in peak amplitudes of acceleration, velocity, and displacement time series obtained from PRISM and CSMIP processing are equal to or less than 4 percent for 99 percent of the data, and equal to or less than 2 percent for 96 percent of the data. Other statistical measures, including the Euclidian distance (L2 norm) and the windowed root mean square level of processed time series, also indicate that both processing schemes produce statistically similar products.

#### Suggested Citation

Kalkan, E., and Stephens, C., 2017, Systematic comparisons between PRISM version 1.0.0, BAP, and CSMIP ground-motion processing: U.S. Geological Survey Open-File Report 2017–1020, 108 p., https://doi.org/10.3133/ofr20171020.

ISSN: 2331-1258 (online)

#### Table of Contents

- Abstract 
- Introduction 
- Integration and Filtering 
- Central-Difference Formula 
- Measuring Time-Series Similarities 
- Statistical Evaluation of PRISM and CSMIP Processed Records 
- Concluding Remarks 
- References Cited 

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