Geology Reference
In-Depth Information
II. Introduction to Geologic Hazards
49
Selected Geologic Hazards by State
FIGURE 11.2
Common geohazards by state: Av, avalanche; Co, coastal; Eq, earthquakes; Fl, floods; Hu, hurricanes; Ls, landslides;
Ts, tsunamis; Vo, volcanoes; So, soils; Su, subsidence.
8.
a.
Do you think that there might or might not be a corre-
spondence between the number and types of geologic hazards
in your state and the number of PDDs (Figure II.3)?
b.
If you live in this circle, what kinds of seismic hazards
might exist in your state if there were a repeat of the
major New Madrid earthquakes of 1811 and 1812?
b. Why?
c.
Are earthquakes a major hazard in your state, accord-
ing to Figure II.2?
9.
Figure II.4 (also in the colored plates section) is a map of
population densities.
a.
Describe what, if any, relationship exists between disas-
ter declarations shown on Figure II.3 and population den-
sity shown on Figure II.4.
Figure II.3 (in color plate section) is a map that shows
Presidential Disaster Declarations (PDDs). Find your county
on this map. What is its name
and what is the name of
I
the state
?
b. Identify some areas where there are lots of disaster dec-
larations but few people.
5. From 1965 through 2000, how many PDDs were there in
your county?
c. Identify some areas where there are few disaster decla-
rations but lots of people.
6.
From your knowledge, does the number of PDDs corre-
spond or not with the number of potentially hazardous geo-
logic events in your county?
Figure II.5 is a graph that shows annual numbers of
Presidential Disaster Declarations. Table II.1 lists US popula-
tion growth for the past few decades.
10. Describe the trend (increasing, decreasing, or similar
terms) of the annual number of Presidential Disaster Decla-
rations between 1953 and 2007.
7. What kinds of geologic or other events do you think might
have led to disaster declarations in your county or state?
