ConcepTest: Foreshock

ConcepTest questions by David McConnell, David Steer ( This site may be offline. ) , Walter Borowski, Jeffrey Dick, Annabelle Foos, Jeffrey Knott, Alvin Konigsberg, Michelle Malone, Heidi McGrew, Kathie Owens, and Stephen Van Horn
This material was originally created for Starting Point:Introductory Geology
and is replicated here as part of the SERC Pedagogic Service.

Initial Publication Date: May 8, 2006
DOI | Cite this

Question:

A seismograph records four earthquakes of magnitude 3.7, 3.2, 6.5 and 4.3 and then seismicity decreases. Which earthquake(s) represent (a) foreshock(s)?

a. 3.7 and 3.2
b. 3.2 only
c. 3.7 only
d. 3.7 and 6.5

Student Responses:

No data yet. The correct response is A.

If you would like to help acquire more Before and After statistics for this example, please contact the authors (see link at top of page).

References and Notes: