The article “Seismic Hazard in Greece Based on Different

Chapter 8, Problem 22SE

(choose chapter or problem)

The article “Seismic Hazard in Greece Based on Different Strong Ground Motion Parameters” (S. Koutrakis, G. Karakaisis, et al., Journal of Earthquake Engineering, 2002:75–109) presents a study of seismic events in Greece during the period 1978–1997. Of interest is the duration of “strong ground motion,” which is the length of time that the acceleration of the ground exceeds a specified value. For each event, measurements of the duration of strong ground motion were made at one or more locations. Table SE22 presents, for each of 121 such measurements, the data for the duration of time  (in seconds) that the ground acceleration exceeded twice the acceleration due to gravity, the magnitude of the earthquake, the distance (in km) of the measurement from the epicenter, and two indicators of the soil type \(s_1\) and \(s_2\), defined as follows: \(s_1=1\) if the soil consists of soft alluvial deposits, \(s_1=0\) otherwise, and \(s_2=1\) if the soil consists of tertiary or older rock, \(s_2=0\) otherwise. Cases where both \(s_1=0\) and \(s_2=0\) correspond to intermediate soil conditions. The article presents repeated measurements at some locations, which we have not included here.

TABLE SE22 Data for Exercise 22

Equation Transcription:

Text Transcription:

s_1

s_2

s_1=1

s_1=0

s_2=1

s_2=0

s_1=0

s_2=0

s_1

s_2

s_1

s_2

s_1

s_2