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Scientific & Technical Reports - The 2002 Denali Fault earthquake

10-Nov-2002 update

PLEASE NOTE:   IF YOU ARE PLANNING ANY FIELD DEPLOYMENTS TO STUDY THE EARTHQUAKE, WE REQUEST THAT YOU PLEASE CONTACT DONNA EBERHART-PHILLIPS, USGS Anchorage, and make her aware of your plans.  She is in contact frequent contact with DGGS and UAF, hence knows of their plans as well.    Contact information for Donna:

Donna Eberhart-Phillips, USGS Anchorage (907) 786-7019;  (907) 786-7425 fax deberhart@usgs.gov 

More detailed information follows under the following headings.

1)    Geologic plans

2)    Preliminary geologic observations

3)    Geotechnical observations

4)    Seismological observations/instrument deployments

5)    Stress transfer modeling

6)    Geodetic observations

7) Remote Sensing

8) Gravity and Aeromagnetic

9)    InSAR coverage looks very promising

10)    Far distance effects of the seismic waves


GEOLOGIC PLANS

From Donna Eberhart-Phillips:

Cindi Preller who works in the Anchorage USGS office used to live in Slana
and is familiar with the region. She is going out and survey damage and
impacts in the sparse settlements. Peter Haeussler organized this through
EERI and they are funding her expenses. She is traveling by plane and will
return Wed or Thurs. She will be in communication with Tom Murray each
day.

From Thomas Murray:

The great weather in Anchorage did not extend to the fault area and they
did not fly today (Nov. 9). Will try tomorrow (Nov. 10).


PRELIMINARY GEOLOGIC OBSERVATIONS

From Lloyd Cluff:

Not everyone knows that the 1958 Lituya Bay earthquake on the Fairweather fault was the first documented case of surface fault rupture propagating up through thick glacial ice. George Plafker was the one to document this phenomena, therefore the Denali fault rupture was not the first!

I am attaching a few slides from work that George and I have taken over the years.
George gave to me the image of the fault rupture through the ice sometime ago and he will be able to tell you the whole story.

PowerPoint File of Images
Individual Thumbnails & Images

From David Schwartz:

Tim Dawson passed along the following surface offset information.
These observations were made on 11/7/02 and 11/8/02 by two teams 1) Tim Dawson and Brian Sherrod (USGS) (DS on list) and 2) Kerry Sieh (Caltech), Charlie Rubin (CWU), Geroge Plafker (retired!) (SRP on list). The offset measurements are listed from west to east along the surface rupture. Column 1 is lat/long in degrees, observing team, and date. Column 2 is right lateral (RL) offset in meters. Column 3 is vertical displacement (V) in meters and sense of slip. The type of offset feature, where noted, is given below the lat/long. Two additional helicopter teams will join the mapping on 11/9. Note that the locations of the largest surface offsets agree well with the region of largest slip modeled in the ERI, University of Tokyo teleseismic inversion.

63.52907, 147.15781 (DS, 11/7) west end of rupture
63.52863, 147.09372 (SRP, 11/8) 0.41±0.5 RL <0.10 V, south up
63.52851, 147.08930 (SRP, 11/8) 1.19±0.25 RL 0.25±0.05 V, south up
channel thalweg
63.52851, 147.03548 (SRP, 11/8) 2.97±0.20 RL 0.50±0.05 V, south up
channel edge
63.51799, 146.81413 (DS, 11/7) 0.00 RL; 1.20 V, south up
63.14725, 144.56769 (DS, 11/7) 4.80 RL; 0.00 V
63.11060, 144.41455 (DS, 11/7) 2.90 RL; 0.87 V, north up
63.09151, 144.3357 (DS, 11/7) 5.10 RL; 0.00 V
63.0443, 144.12878 (DS, 11/7) 7.20 RL 0.00 V
62.91865, 144.12878 (SRP, 11/7) 4.70 RL; 0.80
V, north up
63.02932, 144.06738 (DS,11/8) 8.00±0.75 RL 1.50±0.20 V, north up
stream levee
63.01445, 144.01228 (DS, 11/8) 8.80±0.50 RL 0.00 V
avalanche chute
63.00505, 143.97690 (DS, 11/8) 7.20±0.20 RL 0.00 V
channel edge
62.97697, 143.86637 (DS, 11/8) 5.50±0.10 RL 0.00 V
channel edge
62.95811, 143.79849 (DS, 11/8) 6.30±0.10 RL 0.00 V
root in stream bank
62.90812, 143.79849 (DS, 11/8) 6.90±0.30 RL 0.00 V
stream bank
62.94154, 143.74582 (SRP, 11/7) 5.54 RL; 1.30 V north up
62.94147, 143.74496 (SRP, 11/7) 5.50 RL; 0.95 V south up
62.86455, 143.59507 (DS, 11/8) 5.50±0.75 RL 0.00 V
fissure edge
62.71338, 142.96250 (DS, 11/8) 0.00 RL 0.00 V
eastern segment Denali

Peter reported seeing something "pretty cool" near the western end of the rupture. Just west of the Susitna glacier, there was a snow avalanche that was induced by the earthquake and then offset by the fault. So for whatever reason, there must have been 30-60 sec before the surface rupture happened. Jill McCarthy comments "Are we sure the snow avalanche wasn't induced by the M6.7 earthquake on the 23rd?"

From Mike Blanpied:

Please note these are preliminary and unchecked!

Pair of graphs summarizing the surface offset measurements (PDF)
Data in Excel format


GEOTECHNICAL OBSERVATIONS/PLANS


SEISMOLOGICAL OBSERVATIONS/INSTRUMENTATION DEPLOYMENTS

From John Lahr:

Here is a summary of installations to date biased on phone calls, messages, and a few field notes and some planed that I know about: (times and locations are approximate)
Install date (2002), Location, description, (approximate latitude if known), (approximate longitude if known), Instrument Type, Installer:

Oct 25 CARLO 63N33.085' 148W48.560' Strong Motion AEIC/Guy
Oct 25 HIWA 63N27.530' 148W46.720' Strong Motion AEIC/Guy
Oct 25 M110 (Denali Hiway) 63N18.329' 148W11.219' Strong Motion AEIC/Guy
R109 63N23.716' 148W38.808' Strong Motion AEIC
Oct 25 YAN 63.6559 -148.7749 CMG40T AEIC/Guy
Oct 29 M110 see above CMG40T/Passcal
removed 5TD AEIC/Josh
Oct 29 DH97 = BEAAR DH2 (Denali Hiway) 63N15.975' 147W51.420' CMG 40T/Passcal AEIC/Josh
Oct 30 HIWA see above Strong Motion 5613
removed Strong Motion 5593 AEIC/Josh
Oct 30 YAN see above strong motion 5592
removed Strong Motion 5614 AEIC/Josh
Nov 2 YAN see above PMD 533/Passcal
removed Strong Motion 5592 AEIC/Josh
Nov 2 UCM (Usibelli Coal Mine) 63.91123 -148.88623 40T/Passcal AEIC/Josh
Nov 7 Dot Lake 63.648 -144.0625 CMG3T/Reftek
AC powered AEIC/ Rowdy
Nov 7 Cathedral 25 mi East of Tok 63.43 -143.795 CMG5TD
AC powered AEIC/ Rowdy
Nov 7 Trims Camp K2 USGS/Carver
Nov 7 near Trims Camp K2 USGS/Carver
Nov 7 near Trims Camp K2 USGS/Carver
Nov 7 near Trims Camp K2 USGS/Carver
Nov 7 63.649 (63N38.95') -144.065 (144W03.89') Broad band AEIC/Josh
Nov 7 63.385 (63N23.08') -144.793 (144W47.62') Strong Motion AEIC/Josh
Nov 7 63.23245 -142.2957 Strong Motion AEIC/Josh
Nov 7 Northway 62.96246 -141.9333 Broad band AEIC/Josh
Nov 7 36.8 miles east of
Northway Junction ? AEIC/Josh
planned
Nov 8 near Trims Camp K2 USGS/Carver
planned
Nov 8 near Trims Camp K2 USGS/Carver
planned
Nov 8 near Trims Camp K2 USGS/Carver
planned
Nov 8 near Trims Camp K2 USGS/Carver
planned
Nov 8 near Trims Camp K2 USGS/Carver
planned
Nov 8 near Trims Camp K2 USGS/Carver
planned
Nov 8 Tok cutoff K2 AEIC/Rowdy
planned
Nov 8 Nabesna Road K2 AEIC/Rowdy
planned
Nov 9 HAARP, Gakona AEIC/Rowdy
planned
Nov 9 Meiers Lake AEIC/Rowdy

Realize that this information is preliminary. Please send additions and corrections to me.
We need to develop a list of interested people to send this info to for coordination purposes.


STRESS TRANSFER MODELING


GEODETIC OBSERVATIONS


REMOTE SENSING


REGIONAL GRAVITY AND AEROMAGNETIC DATA


INSAR COVERAGE LOOKS VERY PROMISING


FAR DISTANT EFFECTS OF THE SEISIMIC WAVES

 

 
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