This condition may produce a megaphone-type effect which announces the temblor to those in the direction of the surge. If the epicenter was west of the surge, the noise would travel east. Geographically, if the epicenter was in Glendale, and a surge of charge came from the San Gabriel Valley, persons working at Caltech may hear warning groans, those at UCLA would not. Several fuzzy elements influence EQ occurrences. These factors increase, decrease, or eliminate the possibility of Type II EQ activity.
All elements relate either directly or indirectly to charge build-up process in the atmosphere.
Oceanic influences increase the probability of Type II EQs in several ways. Overnight low temperatures in a particular region can register higher based on several considerations. The amount of 57-60 degree ocean water that displaced 40 degree air temperature is considerable. Because this water radiates heat into the atmosphere, it's reasonable to infer that overnight low temperatures would be higher than if a low tide occurred at that early morning hour. This higher overnight low temperature directly relates to dew point.