Earthquake Along San Andreas Fault Line

This fault bust is an evoke case study because it was not a place tremor, simply rather measured a focal depth of 11 miles. For a California earth quake, a focal depth of 11 miles is unusually deep. Typical or average California quake focal depths range only from 4-6 miles deep at the most.

A side issue related to earthquakes is the give-up the ghostrence of Aftershocks. Some subsequently(prenominal)shocks piece of tail be recorded as being greater than the demonstrable earthquake to which they are connected. The aftershock zone for the Loma Prieta quake stretches about 25 miles. It is located in the area just north of Los Gatos closelipped course 17 and continues south to Watsonville located near Highway 101. It is within this zone that the greatest damage occurred. It is believed that this area corresponds to the rupture associated with the quake's main 7.1 shock and that the zone ranges somewhere from 2 to 11 miles deep.

A magnitude 5.2 aftershock was recorded approximately 2.5 minutes after the initial shock. Although the actual number of aftershocks is incalculable, at this time, it ranges in the thousands for this contingent quake. Just within the week following the quake, seismologists recorded ccc aftershocks with a magnitude reading of 2.5 or greater and 20 of those measured 4.0 or greater on the Richter scale.

While quakes along this fault have been created from horizontal shifts as a allow for in the horizontal slip of the ground on devil sides of the fault southwestward to nor

theast previously, this event quake included a significant upward get-up-and-go of motion. The southwest side was thrust up and over the north-east side and now has a steep dip to the southwest within the area of the thrust.

Another effect of the quake was the much than 1,000 landslides that affected the area, one severe enough to disrupt duty along Highway 17 for about a month. instead of the regular surface displacements usually associated with earthquakes of this magnitude, the Los Gatos to Watsonville zone contains indeterminate cracks, otherwise noted as non-specific surface expression. It is possible that this is a issuing of the rugged topography associated with the area, the thick soil and possibly the forest baffle not allowing the bedrock to rupture and propagate to the ground surface area.

It appears that this rupture did not cause a release in the area and predictions for the area dictate that a 50% come across exists for one or possible more 7.0 magnitude quakes to occur along this site again within the next 30 years. Additionally, the statistical probability of a repeat magnitude quake of the 1906 8.3 size is significant enough for caution to remain high.

www.exploratorium.edu/marina/index.html, 2001. " picking the Marina: an interview with Robert MacKimmie of the California Historical Society".

It [San Francisco] had its biggest change after t
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