Identifying some features of a seismogram

On April 28th, 2007, a magnitude 4.3 earthquake occurred in the English Channel.

The three seismograms on sheet R3 show the arrival of seismic waves from the earthquake at three stations in the UK.

Seismograms from three stations, following the Kent earthquake in April 2007
  1. Which station did the seismic waves reach first?
  2. Find the location of the earthquake and of each of the monitoring stations on a UK map.
  3. Estimate the distance from the earthquake source to each of the stations.
  4. Which waves always arrive first?
  5. How does the difference in arrival time of P-waves and S-waves change as the distance increases?
Station Location Latitude Longitude Sensor Orientation Bandwidth
EDISP BGS offices Edinburgh 55.924 -3.179 SEP East 15 sec-5 Hz
HHUK Hailey Hall School, Hertford 51.778 0.015 SEP East 15 sec-5 Hz
STED St. Edward's School, Poole 50.74 -1.96 Guralp EDU Vertical 30 sec-10 Hz
Event date Time Magnitude Latitude Longitude Depth/ km
28/04/07 07:18.08 4.3 51.1 0.9 2

Teachers' notes

The Kent, April 2007 earthquakeIdentifying some features of a seismogram

Students identify some features on real seismograms and/or use these seismograms to consider differences in arrival times of P- and S-waves at different stations.