RE: What do you know today that you didn't know yesterday?
December 31, 2023 at 1:41 pm
(This post was last modified: December 31, 2023 at 1:56 pm by Anomalocaris.)
The next big earth quake in the San Andrea fault zone is the well know danger associated with California. However, archeology shows California is subject to less well known periodic mega flooding that occur at roughly the same frequency as magnitude 7.5+ quakes on the San Andreas, or roughly once every 100-150 years.
Last such mega flood occurred in 1862 when it drowned 1% of California’s population and rose above the tops of telegraph poles in down town sacramento. Flooding stretched from Oregon to Mexico. It was actually on the small side as far as these mega floods go in California. A previous occurance in 1610 was twice as big. Due to the huge area it affected, a repeat of the 1862 mega flood in California today, now well overdue, will cause an estimated 5 times as much economic damage as the big one on San Andreas striking the greater Los Angeles area during rush hour.
Despite the 1862 flood having occurred well within white man’s tenancy in the state and amply documented in contemporary newspapers and other private and public records, as well as availability of clear geological and archeological evidence of the comparatively frequent reoccurrence of similar flooding events, The flood risk maps used bt the state and most local municipalities in CA for zoning and disaster planning purposes do not account for floods on that scale.
Last such mega flood occurred in 1862 when it drowned 1% of California’s population and rose above the tops of telegraph poles in down town sacramento. Flooding stretched from Oregon to Mexico. It was actually on the small side as far as these mega floods go in California. A previous occurance in 1610 was twice as big. Due to the huge area it affected, a repeat of the 1862 mega flood in California today, now well overdue, will cause an estimated 5 times as much economic damage as the big one on San Andreas striking the greater Los Angeles area during rush hour.
Despite the 1862 flood having occurred well within white man’s tenancy in the state and amply documented in contemporary newspapers and other private and public records, as well as availability of clear geological and archeological evidence of the comparatively frequent reoccurrence of similar flooding events, The flood risk maps used bt the state and most local municipalities in CA for zoning and disaster planning purposes do not account for floods on that scale.
