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SUMMARY OF BORAH PEAK 1983 EARTHQUAKE

For each earthquake there is a detailed listing of the information available: newspaper articles, headlines, photographs, individual accounts, and excerpts from publications. The category of information that each source provides is also listed.

Name:                    Borah Peak, ID
Local Date (Time):       Oct 28, 1983  (8:06 a.m.)
GMT Date (Time):         Oct 28, 1983  (1406)
Location:                ~ 15 mi. W of Mackay, ID
Epicenter:               43 58.20   113 55.20   [6]
Magnitude:               7.3  [6]
Intensity:               IX  [7]
Felt Area:               855,000 Sq. Kilometers [7]

Significant aftershocks: Name: Borah Peak, ID Local Date (Time): Oct 28, 1983 (1:51 p.m.) GMT Date (Time): Oct 28, 1983 (1951) Location: ~ 20 mi. WNW of Mackay, ID Epicenter: 44 03.00 113 55.20 [6] Magnitude: 5.8 [6] Intensity: Felt [7] Felt Area: not available Name: Borah Peak, ID Local Date (Time): Oct 29, 1983 (5:29 p.m.) GMT Date (Time): Oct 29, 1983 (2329) Location: ~ 20 mi. SE of Challis, ID Epicenter: 44 14.40 114 03.60 [6] Magnitude: 5.8 [6] Intensity: Felt [7] Felt Area: not available Name: Borah Peak, ID Local Date (Time): Oct 29, 1983 (5:39 p.m.) GMT Date (Time): Oct 29, 1983 (2339) Location: ~ 20 mi. SSE of Challis, ID Epicenter: 44 14.40 114 06.60 [6] Magnitude: 5.5 [6] Intensity: Felt [7] Felt Area: not available Name: Borah Peak, ID Local Date (Time): Aug 22, 1984 (3:46 a.m.) GMT Date (Time): Aug 22, 1984 (0946 Location: ~ 10 mi. SE of Challis, ID Epicenter: 44 22.20 114 03.60 [6] Magnitude: 5.8 [6] Intensity: V [7] Felt Area: 173,000 Sq. Kilometers [7]

Numbers in brackets indicate source of information. See Reference List

Click here for an explanation of Local/GMT Date, Epicenter/Location, Intensity, Felt Area, Foreshock/Aftershock.

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Newspaper Accounts

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Click here for an explanation of Info Categories.

      
 Challis Messenger (ID) Newspaper Articles

 Deseret News (Salt Lake City, UT)  Newspaper Articles

 Post Register (Idaho Falls, ID) Newspaper Articles

 Salt Lake Tribune (Salt Lake City, UT)  Newspaper Articles

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Photographs Available

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     Description:     Lost Springs fault scarp, ancient and new; Borah Peak 
     Source:          A. J. Crone, U.S. Geological Survey
     Info Categories: G

     Description:     Lost Springs fault scarp bisecting drainage ditch; central Idaho
     Source:          Walter Arabasz, University of Utah Seismograph Stations
     Info Categories: G

     Description:     Lost River Fault Scarp crossing Doublespring Pass Road; central Idaho
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc., Salt Lake City, UT
     Info Categories: G

     Description:     Elk hunter walking out of earthquake area;  Heard Lake, ID
     Source:          Bill Barnes
     Info Categories: I, L, P

     Description:     Boulder adjacent to front porch of home; Challis, ID
     Source:          The Standard-Examiner (Ogden, UT)
     Info Categories: G, P

     Description:     Bridge (foreground) damaged by falling boulder; Challis, ID
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc., Salt Lake City, UT
     Info Categories: G, L

     Description:     Trail of boulder evident on ground; Challis, ID
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc., Salt Lake City, UT
     Info Categories: G, P

     Description:     Boulder and car it hit; Challis, ID
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc., Salt Lake City, UT
     Info Categories: G

     Description:     Rock fall near homes; Challis, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: G

     Description:     Rock fall in kitchen; Challis, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: B, G

     Description:     Flooded farmland; Custer County, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: G

     Description:     Dead fish due to dried warm springs; Custer County, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: G, I

     Description:     Sink-hole from artesian spring near Chilly Butte, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: G

     Description:     Concrete box that rose in soil due to liquefaction.  Ranch near Big Lost River, South-central Idaho
     Source:          Dr. T. L. Youd,  Civil Engineering Dept., Brigham Young University
     Info Categories: B, G

     Description:     Sand boil deposit by ranch house near Big Lost River.  South-central Idaho
     Source:          Dr. T. L. Youd,  Civil Engineering Dept., Brigham Young Univeristy
     Info Categories: B, G

     Description:     Fissures near Highway 93; Custer County, ID
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc., Salt Lake City, UT
     Info Categories: G

     Description:     Old rock building; Challis, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: B

     Description:     Old high school; Challis, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: B

     Description:     IGA Store awning on sidewalk; Mackay, ID
     Source:          The Standard-Examiner (Ogden, UT)
     Info Categories: B

     Description:     Custer Hotel and adjacent home; Mackay, ID
     Source:          The Deseret News (Salt Lake City, UT)
     Info Categories: B

     Description:     Main St. building damage in Mackay, ID
     Source:          The Deseret News (Salt Lake City, UT)
     Info Categories: B

     Description:     Chimney on barber shop; Mackay, ID
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc., Salt Lake City, UT
     Info Categories: B

     Description:     Car damaged by falling bricks; Mackay, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: B

     Description:     City Hall interior damage; Mackay, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: B

     Description:     Mess in grocery store; Mackay, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: N, I

     Description:     People helping people (free coffee); Mackay, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: A

     Description:     Bulldozer moving debris on Main St.; Mackay, ID
     Source:          William D. Richins; Idaho Falls, ID
     Info Categories: B, R

     Description:     Clayton School located at base of cliff;  South-central Idaho
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: B, G

     Description:     Media invade town; Challis, ID
     Source:          The Challis Messenger (Challis, ID)
     Info Categories: I

     Description:     Jack O Lantern face on boulder. Challis, ID
     Source:          Earle S. Eppich, Reaveley Engineers & Assoc.,
     Info Categories: G, H, P

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Individual Accounts Available

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     Description:      Family living on ranch near Mackay, Idaho
     Author:           Haroldsen, Sara Beth
     Info Categories:  E, N, P, R

     Description:      Hunter near Heard Lake in Idaho
     Author:           Barnes, Bill
     Info Categories:  E, G, P

     Description:      Elk hunters who saw fault scarp form
     Author:           Stein, R and, Bucknam, R.
     Info Categories:  E, G, P

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Additional Sources of Information Available

      
     Title:               Earthquakes in Idaho
     Publication:         Seismicity of the United States, 1568-1989 (Revised)
     Info Categories:     B, G, P

     Title:               Quake Replay in the Great Basin
     Publication:         Natural History Magazine, June 1986
     Info Categories:     E, G, P, S

     Title:               REFERENCE CARDS (EERI Journal article summaries)
                                 Summary - L.D. Reaveley Isoseismal Map and Intensity 
                                 Distribution - C.W. Stover Societal Response- J.M. Nigg
                                 Surface Faulting and Other Phenomena - C.L.Taylor, 
                                   R.M. Cline, W.D. Page, D.P. Schwartz
                                 Strong Ground Motion - S.M. Jackson, J. Boatwright
                                 Liquefaction - T.L. Youd, E.L. Harp, D.K. Keefer, R.C. Wilson
                                 Landslides - D.K. Keefer, R.C. Wilson, E.L. Harp, E.W. Lips
                                 Hydrologic Effects - S.H. Wood, C. Wurts, T.Lane, 
                                   N. Ballenger, M. Shaleen, D. Totorica
                                 Structural Control of Groundwater Eruptions and Sediment
                                 Boil Formation in the Chilly Buttes Area - C.J. Waag, T.G. Lane
                                 Buildings and Schools - S.A. Adham, B. Ballif
                                 Industrial Facilities and Equipment at INEL - 
                                   R.C. Guenzler, V.W. Gorman
                                 Performance of Unreinforced Masonry Buildings in 
                                   Mackay, Idaho - R. Reitherman
                                 Lifelines - E.S. Eppich
     Publication:         Earthquake Spectra; Vol.2, No.1; November 1985
     Info Categories:     B, E, G, I, L, P
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