Question

question:
strong earthquakes along the hayward fault near san francisco are forecasted to occur approximately every ____ years, with an 80-year margin of error.

Explanation:

Geological studies of the Hayward Fault, a major transform fault in California, document its seismic recurrence interval. The established average interval for strong (large magnitude) earthquakes here, with an 80-year margin of error, is a well-cited geological finding.

Answer:

140