# Behavior of peak values and spectral ordinates of near-source strong ground motion over the smart 1 array

## Abstract

The array recordings are used to investigate several important properties of the seismic ground motions themselves. The results reported here address the question of the variability of the peak vertical and horizontal accelerations, velocities and displacements. Statistical treatment of the variability is feasible when ground motions are recorded, as in SMART 1, at a group of stations within a limited distance. The three rings of the SMART 1 array have radii of 200 m, 1 km and 2 km. Since it became operational in September 1980, it has recorded accelerations up to 0.33g and 0.34g on the horizontal and vertical components, respectively. At present there are over 3,000 accelerograms from 53 local earthquakes available. From the set of observations, 12 earthquakes have been selected providing more than 700 accelerograms for analysis and statistical treatment. Nonlinear regression procedure are used to fit the peak values to an attenuation form which has as parameters, earthquake magnitude and source-to-site distance. Spectral information on ground motion is included; correlations are made between spectral ordinate values at 23 discrete frequencies in the range of engineering interest. Among the notable results is the finding that the ratio of the vertical to horizontal response spectral ordinates ismore »

- Authors:

- Publication Date:

- Research Org.:
- California Univ., Richmond, CA (United States). Earthquake Engineering Research Center

- OSTI Identifier:
- 7179743

- Report Number(s):
- PB-93-114833/XAB; UCB/EERC-90/17

CNN: NSF-ISI-8619612

- Resource Type:
- Technical Report

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 58 GEOSCIENCES; 22 GENERAL STUDIES OF NUCLEAR REACTORS; EARTHQUAKES; SEISMIC EFFECTS; GROUND MOTION; DATA ACQUISITION; DATA ANALYSIS; NUCLEAR FACILITIES; ENGINEERING; SITE SURVEYS; ALPHA BEAMS; CORRELATIONS; EARTHQUAKE MAGNITUDE; RANGE; REGRESSION ANALYSIS; SEISMIC ARRAYS; SEISMIC WAVES; BEAMS; HELIUM 4 BEAMS; ION BEAMS; MATHEMATICS; MEASURING INSTRUMENTS; MOTION; SEISMIC EVENTS; STATISTICS; 580000* - Geosciences; 220900 - Nuclear Reactor Technology- Reactor Safety

### Citation Formats

```
Niazi, M.
```*Behavior of peak values and spectral ordinates of near-source strong ground motion over the smart 1 array*. United States: N. p., 1990.
Web.

```
Niazi, M.
```*Behavior of peak values and spectral ordinates of near-source strong ground motion over the smart 1 array*. United States.

```
Niazi, M. Fri .
"Behavior of peak values and spectral ordinates of near-source strong ground motion over the smart 1 array". United States.
```

```
@article{osti_7179743,
```

title = {Behavior of peak values and spectral ordinates of near-source strong ground motion over the smart 1 array},

author = {Niazi, M},

abstractNote = {The array recordings are used to investigate several important properties of the seismic ground motions themselves. The results reported here address the question of the variability of the peak vertical and horizontal accelerations, velocities and displacements. Statistical treatment of the variability is feasible when ground motions are recorded, as in SMART 1, at a group of stations within a limited distance. The three rings of the SMART 1 array have radii of 200 m, 1 km and 2 km. Since it became operational in September 1980, it has recorded accelerations up to 0.33g and 0.34g on the horizontal and vertical components, respectively. At present there are over 3,000 accelerograms from 53 local earthquakes available. From the set of observations, 12 earthquakes have been selected providing more than 700 accelerograms for analysis and statistical treatment. Nonlinear regression procedure are used to fit the peak values to an attenuation form which has as parameters, earthquake magnitude and source-to-site distance. Spectral information on ground motion is included; correlations are made between spectral ordinate values at 23 discrete frequencies in the range of engineering interest. Among the notable results is the finding that the ratio of the vertical to horizontal response spectral ordinates is less than the often used value of 2/3 for periods longer than about 0.2 second, and also for all frequencies at distances greater than 30 km from the source.},

doi = {},

url = {https://www.osti.gov/biblio/7179743},
journal = {},

number = ,

volume = ,

place = {United States},

year = {1990},

month = {6}

}