Marker Logo HMdb.org THE HISTORICAL
MARKER DATABASE
“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Anchorage in Anchorage Borough, Alaska — The American West (Northwest)
 

Turnagain Heights Slide

 
 
Turnagain Heights Slide Marker image. Click for full size.
By Byron Hooks, September 1, 2013
1. Turnagain Heights Slide Marker
Inscription. You are standing on the edge of the Turnagain Heights Slide, the largest and most destructive landslide in Anchorage.

Ninety seconds into the Good Friday Earthquake, an 8,000-foot strip of bluff, 1,200 feet wide began cracking apart into larger blocks which slid toward Cook Inlet. With a savage and grinding roll, the slide transported some homes 500 feet seaward, and broke apart or crushed other homes. Residents rushed outside their homes only to be thrown to the ground as the blocks pulled apart and heaved around them. Others were trapped in their homes. The slide movement continued for 90 seconds after the earthquake stopped shaking Anchorage. Over 12 million cubic yards of sand, clay and gravel slid off toward the inlet, 75 homes were destroyed, and four people perished.

Bootlegger Cove Clay
Underneath most coastal Anchorage is a deep layer of gray- blue material called Bootlegger Cove Clay. This silty plastic clay is composed of estuary-miarine sediment, and was deposited 15,000 to 30,000 years ago by massive glaciers that covered most of south-central Alaska. Unfortunately, it can be extremely soft and unstable. During an earthquake Bootlegger Cove Clay tends to liquefy and lose strength and where the upper clay layers contain loose sand layers, it can dramatically fail.
 
Location.
Turnagain Heights Slide Marker image. Click for full size.
By Byron Hooks, September 1, 2013
2. Turnagain Heights Slide Marker
61° 11.911′ N, 149° 58.802′ W. Marker is in Anchorage, Alaska, in Anchorage Borough. Click for map. This marker is located in Earthquake Park on W Northern Lights Blvd. It is also accessible from the Tony Knowles Bicycle Trail. Parking is available on W Northern Lights Blvd. (N 61 11.756 W 149 58.578). From the parking lot, follow the paved path to the marker. Marker is in this post office area: Anchorage AK 99502, United States of America.
 
Other nearby markers. At least 7 other markers are within 5 miles of this marker, measured as the crow flies. The Earth Did Quake (here, next to this marker); Measuring the Magnitude of Damage (a few steps from this marker); Tsunami! (within shouting distance of this marker); Anchorage Aloft! (about 400 feet away, measured in a direct line); Captain James Cook (approx. 2.9 miles away); Resolution Park 1776 / 1778 (approx. 2.9 miles away); What is this “Rock Man”? (approx. 4.3 miles away).
 
Also see . . .
1. Great Alaskan earthquake of 1964. You Tube video (Submitted on October 2, 2013, by Byron Hooks of Sandy Springs, Georgia.) 

2. AEIC: Alaska Earthquake Information Center. (Submitted on October 2, 2013, by Byron Hooks of Sandy Springs, Georgia.)
3. ASK: 1964 Alaska earthquake. (Submitted on October 2, 2013, by Byron Hooks of Sandy Springs, Georgia.)
4. Wikipedia: 1964 Alaska earthquake. (Submitted on October 2, 2013, by Byron Hooks of Sandy Springs, Georgia.)
Turnagain Heights Slide Marker image. Click for full size.
By Byron Hooks, September 1, 2013
3. Turnagain Heights Slide Marker

5. Wikipedia: Megathrust earthquake. (Submitted on October 2, 2013, by Byron Hooks of Sandy Springs, Georgia.)
 
Categories. Disasters
 
Cook Islet image. Click for full size.
By Byron Hooks, September 1, 2013
4. Cook Islet
Earthquake Park image. Click for full size.
By Byron Hooks, September 1, 2013
5. Earthquake Park
Earthquake Park image. Click for full size.
By Byron Hooks, September 1, 2013
6. Earthquake Park
 
 
Credits. This page originally submitted on , by Byron Hooks of Sandy Springs, Georgia. This page has been viewed 566 times since then and 26 times this year. Last updated on , by Byron Hooks of Sandy Springs, Georgia. Photos:   1, 2, 3, 4, 5, 6. submitted on , by Byron Hooks of Sandy Springs, Georgia. • Syd Whittle was the editor who published this page. This page was last revised on June 16, 2016.
Paid Advertisement