**SEQ CHAPTER \h \r 1Geol 210: Homework #2** Name _______________________

Locating Earthquakes and Measuring Their Magnitude

The figure below shows seismograms for the same earthquake that were recorded at 3 different locations (Fontana, Kramer Junction, and CSUSB). The horizontal axis is time. Each tick mark represents one second, and selected times are labeled in hours:minutes:seconds. The vertical axis is amplitude of shaking, and the amplitude scale is shown next to the seismogram recorded at CSUSB.

1) **Mark with an arrow** the arrival of the p-wave, the s-wave, and the surface wave on each of the 3 seismograms

2) From the seismograms, **calculate the time delay** between the arrival of the p-waves and the arrival of the s-waves at each station and write your answers in the table below.

Station | S wave arrival time | P wave arrival time | Time delay between S & P | Distance to earthquake |

Fontana | ||||

Kramer Junction | ||||

CSUSB |

3) Using the diagram below and the time delay between the arrival of the p-waves and the s-waves, **calculate how far away the earthquake was from each of the three stations**, and write your answers in the table on the previous page.

4) What was the maximum **amplitude** of shaking at the CSUSB station? ___________

5) Using the maximum amplitude of shaking at CSUSB and the time delay between the p and s waves at the CSUSB station, use the diagram below to **calculate the magnitude** of this earthquake.

6) Use the distance of the earthquake from each of the 3 stations in your table (Fontana, Kramer Junction and CSUSB) to **plot the location of the earthquake**.

Magnitude = ______________Blog ArchiveCopyright © 2018 Homew