SN12

3/27/00

00 47.22 S LATITUDE
91 06.16 W LONGITUDE

General Location and Strategy: SN12 is part of the caldera rim grid located on the northeast rim, just above Camp Chico. As well, it is inboard of several of the youngest eruptive vents so may be important to catch a diking event.

Field Notes:

Days measured:  05 Jan 00 - 06 Jan 00

(E rim of caldera)

Monument SN12 is bonded into a 5X5m clearing of volcanic rock ~1m immediately to the E of the main trail along the caldera rim.

Antenna height:  0.613m + 0.108m = 0.721m (04 Jan 00); 0.614 + 0.108m = 0.722m (05 Jan 00)
Antenna offset:  0.353m

Power up:  0748h, 04 Jan 00 (local);  1557h (GMT)/ 0957 (local), 05 Jan 00
Power down:  1718h (local), 06 Jan 00
 

2000 Results:

SN12 suffered from multiple power outages on 1/4/00, and all of those data were discarded. Data from 2 GPS days were combined (1/5/00-1/6/00). Solution was made by fixing Base (SN01).

The first reported uncertainty uses the sigma of the coordinate group as a scaling factor and may be too pessimistic. The second uses the sigma of the single difference observations as a scaling factor.

X = -122760.9724 ± 1.7, 0.4 mm
Y = -6377370.642 ± 27, 2.2 mm
Z = -87028.6469 ± 10.2, 0.4 mm

ht. = 1012.7543
Lat. = -0 47 13.052290
Long. = -91 06 9.996849

This is looking back (looking SE) toward SN12 from near a high hill
of fresh cinder on the NE rim.