Portable Seismic Network

August 15, 2007

Google Earth Maps of Crandall Canyon and Locations of Portable Stations

crandallsideview crandalltopview

Table1

Digital Instrumentation* with Onsite Recording
Station Name	Location (WGS84datum)			Sensor	DAS S/N
Station Name	Lat. N	Lon. W	Elevation (ft)	Sensor	DAS S/N
CM1	39° 27.99´	111° 14.08´	9,062	Reftek 130 MEMs	936b
CM2	39° 28.13´	111° 13.06´	10,553	Reftek 130 MEMs	936a

* Portable REFTEK-130 DAS with External MEMs accelerometers

Table 2

Analog Telemetered Stations
Station Name	Location (WGS84datum)			Sensor	Seismometer Parameters
Station Name	Lat. N	Lon. W	Elevation (ft)	Sensor	Rc	Rd	Gain
CM3	39° 26.78´	111° 12.86´	10,476	Mark Products L-4	5500	4311	1600
CM4	39° 30.53´	111° 15.68´	9,072	Mark Products L-4	5463	7891	1600
CM5	39° 28.04´	111° 8.90´	7,765	Mark Products L-4	5495	4337	1600

* Rc- data coil resistance in ohms

Rd- damping resistance

Field Notes

August 10, 2007

Five stations were installed between Tuesday, Aug. 7 and Thursday, Aug. 9. The first two were stand-alone RefTek 130 digitizers with external MEMS accelerometers. The last three were our analog portable system with Mark Products L-4s and UUSS VCO. Telemetry for these three stations was brought on-line at 12:00 MDT Aug 10. For installation purposes we named the sites as CM1-5 (for Crandall Canyon Mine 1-5) with the number reflecting the order in which the site was installed. Detailed information for all stations is contained in the above tables. General comments follow:

CM1 - installed early evening 8/7/07. Soil site directly on top of UUSS original epicentral locations, a short distance west of the mine. The MEMS is buried in tightly packed soil beneath the electronics/battery enclosure. Solar panel mounted nearby. Site is very close to the helicopter staging area. Sensor is accurately oriented and leveled and channels 1-3 on the DAS reflect the Z, N, and E components of the sensor.

CM2 - installed ~ 12 noon 8/8/07 directly on top of the collapse area and a short distance east of the drilling area. The MEMS was bolted to bedrock. Recording system and battery in adjacent rubbermaid tub. Same sensor orientation and channel mapping as CM1.

CM3 - This site was installed late afternoon 8/8/07 with a single component L-4 one mile south of CM2. This is a soil site and is co-located with a radio telemetry relay.

CM4 - Installed morning of 8/9/07. Single component L-4. This is a soil site located approximately 5 miles NW of mine for azimuthal control.

CM5 - Installed late afternoon 8/9/07. Single component L-4. This is a bedrock site approximately 5 miles east of collapse for azimuthal control.

Data were downloaded from the RT130 sites mid-day on Thursday Aug 9.

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