Darwin recorded uplift of 3 meters after the 1835 Chilean earthquake. That was a

Question

Darwin recorded uplift of 3 meters after the 1835 Chilean earthquake. That was a subduction zone megathrust quake, with a primarily vertical component to the elastic rebound. Along the San Andreas Fault movement is primarily horizontal. At a restraining bend such as that forming the San Gabriel Mountains in the Transverse Ranges (a left step along the right-lateral San Andreas Fault), assume a maximum uplift of 1 meter per earthquake. Given the number of earthquakes you calculated above, what would be the resulting maximum uplift of the San Gabriel Mountains? ( 1737.6) 5. The highest elevation in the San Gabriel Mountains is 3,069 meters. Given your answer to (4) above, does this seem at least possible as the result of cumulative small uplifts due to recurring earthquakes along the San Andreas Fault? What might account for the difference between the maximum uplift you calculated and the actual elevation of these mountains?

Explanation / Answer

San Gabriel mountain range lies along a large restraining bend in Southern California. The active thrusting along the Cucamong and Sierra Medre fault zones have Holocene vertical slip rate of about 0.5-0.9mm/year at their southern range front. Uplift of the San Gabriel Mountains begins at about 5-7 Ma when the tectonity activity switches from San Gabrias to Current San Andreas Fault.

Surface Uplift=uplift of rock-exhumation

Surface uplift: the displacement of the earth's surface in comparison to the geoid

Uplift of rock:displacement of rock takin geoid as the reference

Exhumation: displacement of rock as compared to the geoid

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