Is there any connection between mount saint helens earthquake and the loma prieta earthquake?

Answer 1

Both Mount Saint Helens and the San Andreas Fault (source of the Loma Prieta Earthquake) sit on the Pacific Ring of Fire, but there really is little connection between the two. They both sit on the North American Plate, but San Andreas is a transform boundary with the Pacific Plate (meaning the plates move by each other), while Mount Saint Helens sits on a convergent boundary, where the Juan de Fuca plate is subducting beneath the N. American plate. A connection between the events is unlikely.

Answer 2

No, the Mount Saint Helens eruption in 1980 was caused by a volcanic event, while the Loma Prieta earthquake in 1989 was caused by movement along the San Andreas Fault. They were unrelated geologic events occurring in different regions with different geological processes.