Part 1: Earthquake Intensity: Estimate the Mercalli intensities using the modified Mercalli intensity scale.
The intensity of earthquake shaking at any location is determined not only by the magnitude of the earthquake and its distance, but also by the type of underlying rock or unconsolidated materials. If buildings are present, the size and type of buildings (and their inherent natural vibrations) are also important.
Intensity _Earthquakes.PNG
Intensity scales were first used in the late 19th century, and then adapted in the early 20th century by Giuseppe Mercalli and modified later by others to form what we know call the modified Mercalli intensity scale (Table 1). Intensity estimates are important because they allow us to characterize parts of any region into areas that are especially prone to strong shaking versus those that are not. The key factor in this regard is the nature of the underlying geological materials, and the weaker those are, the more likely it is that there will be strong shaking. Areas underlain by strong solid bedrock tend to experience much less shaking than those underlain by unconsolidated river or lake sediments.
Table 1: The modified Mercalli intensity scale.
Assignm2-Mercalli.PNG
The following observations were made by residents of the Nanaimo area during the M6.8 Nisqually earthquake near Olympia, Washington, in 2001. Estimate the Mercalli intensities using the modified Mercalli intensity scale? (you need to complete the table filling the Intensity part).
Building Type
Floor
Shaking Felt
Lasted (seconds)
Description of Motion
Intensity?
House
1
no
10
Heard a large rumble lasting not even 10 s, mirror swayed
House
2
moderate
60
Candles, pictures and CDs on bookshelf moved, towels fell off racks
House
1
no
Pots hanging over stove moved and crashed together
House
1
weak
Rolling feeling with a sudden stop, picture fell off mantle, chair moved
Apartment
1
weak
10
Sounded like a big truck then everything shook for a short period
House
1
moderate
20-30
Teacups rattled but didnt fall off
Institution
2
moderate
15
Creaking sounds, swaying movement of shelving
House
1
moderate
15-30
Furniture banging & dog barking aggressively
Part 2: Earthquake location Map
Check the Live Earthquake location Map found at:
http://quakes.globalincidentmap.com/Links to an external site.
and answer the following question:
What was the magnitude and location of the largest earthquake recorded recently?
P.S. Since the above website updates earthquake info minute by minute, you will need to write the date / time you accessed the Website!
Download this assignment from here: Assignment 4-Earthquake Intensity and Most Recent Earthquake locations.docx Download Assignment 4-Earthquake Intensity and Most Recent Earthquake locations.docx
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