Question

what was the 1986 earthquake in california, along the san andreas fault, an example of? a tsunami a transform fault earthquake a volcanic eruption

Explanation:

1. Analyze option "a tsunami": A tsunami is a series of ocean waves caused by underwater disturbances (like earthquakes, but the 1986 California earthquake itself isn't a tsunami; tsunamis are effects of some earthquakes, not the earthquake type here.
2. Analyze option "a transform fault earthquake": The San Andreas Fault is a transform fault (where two tectonic plates slide past each other horizontally). The 1986 California earthquake along this fault fits the definition of a transform - fault earthquake.
3. Analyze option "a volcanic eruption": A volcanic eruption involves magma, ash, etc., from a volcano. The 1986 California earthquake along the San Andreas Fault is not a volcanic eruption.

Answer:

B. a transform fault earthquake