Jefferson County - East-West Gateway Coordinating Council

A Regional Overview All-Hazard Mitigation Plan 47
FIGURE J29 PEAK ACCELERATION
Source: United States Geological Survey
Franklin County lies in five peak acceleration zones running northeast to southwest ranging
from a high of almost 9 in the southeastern corner to a low of 4%g of severity in the
northwestern corner. St. Charles County lies within four peak acceleration zones running
northeast to southwest ranging from a high of 8 in the easternmost portion of the county
to a low of about 5%g severity in the northwestern corner of the county. St. Louis County
lies in four peak acceleration zones running northeast to southwest ranging from a high of
15 in the southeastern portion to a low of about 7%g severity in the northern and western
portions of the county. St. Louis city lies in two peak acceleration zones ranging between
9 (almost entire portion of the city) and 15%g severity (in the very southern portion of the
city).
The locations of recorded landslides, sinkholes, and mineshaft collapse in the St. Louis
Metropolitan region is summarized in Table J33 above.