Tsunami! EarthCache

This cache has been archived.

GeoCrater: I am regretfully archiving this cache since there's been no word from the owner in the month or more since the last reviewer note was posted. If you want to re-activate the cache during the next couple of months, please contact GeoCrater to see if that's possible. If the cache meets current guidelines, consideration will given to the circumstances surrounding the original archival.

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Hidden : 7/24/2008
Difficulty:
1 out of 5
Terrain:
1 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

Coordinates are for the information panel where answers to the questions below can be found.

Tsunamis are large ocean waves that are caused by underwater earthquakes, landslides, volcanic eruptions and even meteorites. In the open ocean, tsunamis travel at an average of 450 mph but are hard to detect because their wavelengths can be hundreds of miles long. As a tsunami approaches landfall, it will slow down but increase in amplitude. The largest tsunamis have been over 100 feet high. The areas at greatest risk from a tsunami are coastal areas within a mile of the shoreline and less than 25 or 30 feet above sea level.

There is often no advance warning of an approaching tsunami. However, since earthquakes are often a cause of tsunami, any earthquake occurring near a body of water may generate a tsunami if it occurs at shallow depth, is of moderate or high magnitude, and the water volume and depth is sufficient.
If the first part of a tsunami to reach land is a trough (draw back) rather than a crest of the wave, the water along the shoreline may recede dramatically, exposing areas that are normally always submerged. This can serve as an advance warning of the approaching tsunami which will rush in faster than it is possible to run. If a person is in a coastal area where the sea suddenly draws back (many survivors report an accompanying sucking sound), their only real chance of survival is to run for high ground or seek the high floors of high rise buildings.

The Pacific Northwest is the site of the Cascadia subduction zone, where an oceanic tectonic plate (the Juan de Fuca plate) is being pulled and driven (i.e., subducted) beneath a continental plate (the North American plate). Earthquakes along the fault that is the contact between the two plates, termed the interplate thrust or megathrust, may generate significant local tsunamis in the Pacific Northwest.
On Good Friday in 1964, the largest earthquake ever recorded in North America struck Anchorage, Alaska. Shifting tectonic plates displaced billions of tons of ocean water and sent tsunami waves rushing at the speed of a jetliner down the coast of the Pacific Northwest.
Residents of Crescent City, California remember when their waterfront town of about 7,500 was devastated when the tsunami swept in from the Pacific Ocean early on March 28, 1964. The business district was leveled, and 11 people were killed.
Crescent City is the only town in the continental United States where people have been killed by a tsunami. Reminders of the tragedy are abundant in the town, and residents take tsunami warnings very seriously.

Although a tsunami cannot be prevented, the impact of a tsunami can be mitigated through community preparedness, timely warnings, and effective response.

A TSUNAMI ADVISORY means an earthquake has occurred in the Pacific basin that could cause a tsunami. Hourly bulletins will be issued by WC/ATWC and PTWC.

A TSUNAMI WATCH means that a tsunami has or may have occurred but is more than two hours travel time to the watch area. Local authorities should begin preparations for a possible evacuation of the watch area.

A TSUNAMI WARNING means that a tsunami that may cause damage has or may have occurred. People in the warning area are advised to evacuate.

More information and data can be found at:
www.tsunamiwave.info (visit link) (visit link)

Questions:
1. How far is the fault zone offshore?
2.Which 2 plates are being forced togethor?
3. Who do you contact for additional information?
4. In the lower left hand corner is a seal. What is the date on it?

FTF Tsunami!: Kenny Art

Additional Hints (Decrypt)

Urnq sbe uvtu tebhaq vs n Gfhanzv vf pbzvat!

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)


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