Geoscience Reference
In-Depth Information
65°
70°
75°
80°
85°
90°
95°
100°
105°
110°
115°
120°
125°
130°
135°
140°
145°
45°
45°
40°
40°
35°
30°
30°
25°
110°
115°
120°
20°
20°
20°
15°
15°
10°
10°
5°
15°
5°
90°
95°
100°
105°
110°
115°
120°
125°
110°
Fig. 3.25 First- and second-order national GPS networks
Crustal Movement Observation Network of China
The Crustal Movement Observation Network of China (CMONOC) was
established from 1998 to 2002 by CEA, SMBGSH, and CAS (cf. Fig.
3.26
). It is
a monitoring network with earthquake prediction as its primary purpose. Its stations
are mainly distributed on China's large plates and around its seismically active
areas. CMONOC contains the datum network stations, the basic network stations,
and the regional network stations, 1,222 stations in total. Among them, the average
distance between datum stations (the continuous year-round observation GPS
stations) is 700 km while that between basic stations (the periodic repetition
observation stations) is 350 km. The datum and basic networks are mainly distrib-
uted on the larger plates in China. The regional network points are irregular
repetition observation points, with spacing ranging from dozens to hundreds of
kilometers. They are unevenly distributed across the country, more densely in areas
with active crustal movement. The overview of CMONOC is shown in Table
3.3
.
The coordinate framework adopted in the adjustment is ITRF97 at the epoch of
2000.0.
China's National GPS Control Network 2000
Large-scale GPS networks, such as the established A- and B-order national GPS
networks, the national first- and second-order nationwide GPS networks, and
Search WWH ::
Custom Search