Question: On which day in 1989 did this earthquake occur in which the fireboat "Phoenix" was instrumental in saving the Marina District buildings from further destruction?
Sentence (from "Guardian (fireboat)"): "Guardian" was a gift to the people of San Francisco by anonymous donors following the notable role of the fireboat "Phoenix" in helping to save the Marina District buildings from further destruction by fire following the 1989 Loma Prieta earthquake.
Relevant evidence: Yes