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Scientific & Technical Reports - The 2002 Denali Fault earthquake

11-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 Donna Eberhart-Phillips:

Monday afternoon report from Peter Haeussler and Patty Craw-
They are very cold but jazzed about their thrust fault. They have investigated the western end of the Susitna Glacier Fault. It extends across the mountainside to the southwest of the Susitna Glacier. It appears to go back across the West Fork Glacier although there is not a clear scarp, more of jumbled mud masses. But there is a short scarp across
on the west side of the West Fork Glacier. They are very impressed with some locally huge displacements of 6.2-6.4m.

A few coords:
The western limit of the significant slip scarp is 63deg 24.199' 147deg 27.625'
The westernmost short scarp is 63deg 24.481' 147deg 39.690'
So the rupture length of the thrust is approx 40km. It is difficult to get good dip measurements, but wherever they can it is low angle, 10 to 25 deg. Thus this surface trace of a shallow dip thrust may be very consistent with
the mainshock hypocenter which is located roughly 10 km north at 5 km depth under the West Fork Glacier.

From Mike Blanpied:

Please note these are preliminary and unchecked!

Pair of graphs summarizing the surface offset measurements (PDF or GIF) updated!
Data in Excel format updated!


GEOTECHNICAL OBSERVATIONS/PLANS

From Thomas Murray:

Low ceiling and ground fog reported out there. Aeromap launched the aircraft sometime this morning - weather to the east of Paxson may be workable. To the west doesn't look good. Low clouds and ground fog prevented Cindi Preller
from flying in a small plane to different areas for her community survey. Peter reported that they were fighting low clouds also.

I talked to Rod Combellick with the State. He inquired of the Dept. of Transportation and confirmed that they have no intent to do any detailed surveys of the highways crossing the fault area. The last survey for the highway next to the pipeline was done sometime in the late 80's.


SEISMOLOGICAL OBSERVATIONS/INSTRUMENTATION DEPLOYMENT


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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