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See AnswerSee Answer done loadingQuestion: GEOL 1102 GEOLOGIC HAZARDS Lab #3 Earthquake Hazards Below is a chart listing the damage and experiences in different cities during the same earthquake. For each city, use the attached Modified Mercalli Scale and assign local intensity values for this earthquake. Then place
GEOL 1102 GEOLOGIC HAZARDS
Lab #3 Earthquake Hazards
Below is a chart listing the damage and experiences in different cities during the same earthquake. For each city, use the attached Modified Mercalli Scale and assign local intensity values for this earthquake. Then place the Intensity value next to each city on the map.
CITY
DAMAGE and OBSERVATIONS
ESTIMATED INTENSITY
ASHLAND
Hanging lamps swayed
BEAR CREEK
People outdoors did not notice anything
I
BURNEVILLE
Felt by people sitting at dinner
CEDAR PASS
Families sitting at dinner noticed dishes rattling
DODGE
Dishes, windows, and doors rattled
EMERYVILLE
Not felt
FALLS
Felt by nearly everyone. A few windows were broken
FORKS
Big windows in stores downtown were broken
GRANTS PLAIN
Church bells rang all over town. Plaster walls developed cracks. Candlesticks fell of the mantle.
GREENBURG
Not much damage, but felt by everyone.
HILLSDALE
Some plaster ceilings fell. Many people were scared.
KEMPOE
Felt by some people on upper floors, some windows rattled.
LEEDS
Noticed by many people working late in tall buildings
OAKDALE
Felt only by a few people
PETERSON
Felt by almost everyone. Some plaster ceilings fell down.
RED HILLS
People inside watching television noticed the vibrations.
RIVER GLEN
Felt by almost everybody.
SANDPOINT
Many windows were broken. Some people were scared.
SPLIT ROCK
Poorly built structures were badly damaged. A few drivers noticed their cars moving strangely for a moment.
TRAVIS CITY
Felt by almost everybody. Church bells rang.
TUCKER
Books fell off shelves in the main library. Some windows were broken.
VERNON
Dishes in cupboards rattled. Felt by people indoors.
VICTOR
Most people were alarmed and ran outside. Chimneys were broken.
VISTA
Felt only by people in upper floors of tall buildings.
WELLS
Noticed by people on the third floor. Some windows rattled.
WESTBURY
Some people noticed the vibrations, but thought it was a freight train.
WHEATFIELD
People sitting at the dinner table noticed doors and windows rattling.
YALCO
Many people ran outside. Many windows were broken.
Write your estimated intensity next to each city on the attached map.
Using these intensities, you will construct an lsointensity (or isoseismal) map, a contour map showing areas of equal intensity for the earthquake. To do this, you draw lines enclosing areas of the same intensity. The lines drawn are your estimated boundaries between these areas of equal intensity. You will have to estimate where these lines will go in the areas that have no data. Colored pencils may be used to more clearly show these areas.
Isointensity maps are commonly used to determine the epicenters and strengths of historical earthquakes for which there are no measurements of magnitude. Epicenters of most earthquakes are near the areas with the strongest intensity.
After constructing your isointensity map, answer the following questions:
1. What cities were nearest the epicenter? How did you determine this?
2. Using the scale of the map, determine the approximate width of the zone with an intensity of V.
3. What are possible sources of error when using the intensities of an earthquake to estimate the location of an epicenter?
MODIFIED MERCALLI SCALE
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Assigning Intensity Values: Using the observations and damage reported in different cities, y...
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