Why did the Mission Peak landslide reactivate in 1998?
A. This year’s reactivation was likely triggered by the unprecedented levels of moisture recorded in this area since January 1993. All-time highs in cumulative rainfall have been recorded during the 1990s, for two, three, four, five and six year periods. This wet sequence was preceded by a 6-year all-time low in cumulative precipitation, between 1986-92 (data presented in Appendix D of Vol.
