A.A: Views shown by photos below; click on letter designation to jump down.
A, B, C, D, E, F, G, H, I, I.A, I.B, J, J.A, K, L, L.A, M, N, O, P, Q, R, R.A, S, S.A, T, U, V, W, X, Y, Z, AA, AB, AC, AD, AE, AE.A, AE.B, AF, AG, AH, AI, AJ.
A.A: Views shown by photos below; click on letter designation to jump
down.
A,
B,
C,
D,
E,
F,
G,
H,
I,
I.A,
I.B,
J,
J.A,
K,
L,
L.A,
M,
N,
O,
P,
Q,
R,
R.A,
S,
S.A,
T,
U,
V,
W,
X,
Y,
Z,
AA,
AB,
AC,
AD,
AE,
AE.A,
AE.B,
AF,
AG,
AH,
AI,
AJ.
B: The Canyonlands area, and all of the Colorado Plateau, is being eroded
rapidly by the Colorado River to a base level thousands of feet lower than
the former base level, now at the top of high mesas.
C: The region around Upheaval Dome is sparsely vegetated, but interrupted
by sheer, high cliffs. Soil suitable for planting seismic-wave sensors
(geophones) was difficult to find.
D: Aerial view SW from over Upheaval Canyon toward the Green River.
E: Aerial view NW from the west end of Buck Mesa toward the Green River.
F: Aerial view NW down Taylor Canyon, just north of Upheaval Dome.
The far end of this narrow wall, 300 feet high, is known as Zeus and Moses.
G: Part of the central depression of Upheaval Dome, viewed from the
north rim. The greenish rocks are highly deformed and uplifted Moenkopi
having a unique coloring.
H: Park Service plaque at the Upheaval Dome overlook explaining the
salt dome hypothesis for its origin.
I: Park Service plaque at the overlook giving the impact hypothesis.
Seismic Refraction
I.A: Unpacking the 15 RefTek recorders and refraction cable reels
near the Island in the Sky Visitor's Center (Sergio Chavez-Perez).
I.B: Marcos Alvarez of IRIS assembling the RefTek recorders (Sergio Chavez-Perez).
J: The seismic refraction phase of the experiment used four days of
Bell Jet Ranger helicopter time contracted from Pacific Western Helicopters
in Provo, Utah.
J.A: The copter taking off from the Willow Flat landing zone
(Sergio Chavez-Perez).
K: The incredibly rugged topography around Upheaval Dome made the
use of the helicopter necessary for ferrying equipment and
scientific parties to remote sites in and north of the Dome, where
seismic waves sped up by any salt might be detected.
L: The helicopter dropped RefTek refraction recording instruments, cables,
geophone sensors, and installation crews at seismic receiver sites .
L.A: The copter at a tricky landing site (Sergio Chavez-Perez).
M: Helicopter flying through a 1000 ft deep notch in Navajo sandstone, to
place 150 lb instrument packages deep in Syncline Valley, a half day's walk
from the road.
N: View NW while flying through the notch.
O: The helicopter made it possible to place refraction recording instruments
within the central depression, since a half day's steep climb is the only other
way to access the depression from the road.
P: View N of the location of two RefTek refraction recorders and
six geophone strings just inside the notch.
R: RefTek recording three geophone strings in Kayenta just north of the
central depression.
R.A: John Louie at one of the refraction recorders (Sergio Chavez-Perez).
S.A: A fuel truck met the copter daily at the Willow Flat landing zone
(Sergio Chavez-Perez).
T: Both the seismic refraction and reflection surveys recorded seismic
waves generated by repeatedly lifting and dropping a 700 lb, trailer-mounted
weight. The Univ. of Utah supplied this device.
U: During recording, helicopter support allowed checking the RefTeks
in the field, and downloading test data.
V: Marcos Alvarez of IRIS downloaded 5 gigabytes of refraction data
from the RefTek recorders with a Sun Sparc 5 set up in a travel trailer near
the Island in the Sky Visitor Center.
W: An EDM theodolite (here on the north edge of the central depression)
sighted elevations of gravity stations to 0.5 m accuracy.
Seismic Reflection
X: View W of NW end of reflection survey near Whale Rock, along Upheaval
Road.
Y: Recording truck at center of two 24-channel spreads. Main cables are
orange, geophone strings are blue.
Z: View SE of east end of reflection survey along Upheaval Road.
Geology
AA: Radial-axis folds at the base of the Wingate exposed on the north edge of
the central depression.
S: Massive Navajo sandstone in the ring syncline sits atop highly deformed
Kayenta north of the central depression.
Q: Aerial view NE of the upper part of Syncline Valley, just inside the
notch.
AB: Clastic dike of White Rim sandstone separating Kayenta and Navajo
on the central side of the ring syncline.
AC: Kayenta fracturing and faulting in the ring syncline.
AD: Pervasive small-scale faulting of Kayenta in the ring syncline.
AE: Spheroidal weathering in Kayenta accentuated by bedding colors.
AE.A: Sergio Chavez-Perez at an abyss (Sergio Chavez-Perez).
AE.B: Kayenta blocks against a rare sky for January
(Sergio Chavez-Perez).
Arches National Park
AF: Balanced Rock, Arches.
AG: Cross-bedding in the Navajo sandstone.
AH: View to N of Moab normal fault, down to east.
