^Summary:

    ^{The G4 project is designed to detect the location and movement of magma deep beneath two of the great Galapagos shield volcanoes, Sierra Negra and Fernandina.  The project is funded by the U.S. National Science Foundation. We are using 3 techniques to accomplish our goal. First, we are making year-to-year deformation measurements by deploying geodetic-quality GPS instruments. Second, Dan Johnson is overseeing a microgravity experiment designed to measure minute changes in mass as magma moves and vesiculates. Third, we make basic geologic observations that build on prior studies by us and other workers.}
 

^{The Continuous Network}

^{In 2001, we were funded to install 2 dual frequency and 4 single frequency permanent receivers on Sierra Negra. These were successfully installed in June, 2002, thanks to the efforts of Chuck, Karl, and Warren.  The data are streamed via radiomodem to the Darwin Station, and we download them over the internet from there.}
 

^{Co-investigators:}

^{Dennis Geist
Bill Chadwick
Dan Johnson}

^{with help from:
Terry Naumann
Chris Small
Dave Lewis
Mike "Canteen Boy" Poland
Trey Apel
Frank Atwill
Gorki Ruiz
Karen Harpp
Kim Whipple
Daniel Cardenas
Chuck Meertens
Warren Gallagher
Karl Feaux}

^{We got press from Geotimes!}
 

^{Examine the project summary of our successful grant proposal.}

^{Look at some pictures of the installation of the continuous network on Sierra Negra.}

^{Check out the photographic chronicles of the 2000 trip.}

^{And the photographic chronicles from 2002.}

^{Learn about route-finding hints on Sierra Negra and Fernandina.}

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The Geodetic Campaign

^{The following stations (SN01 through SN27 and FE01 through FE20) mark monument locations.  Most of the monuments are 5cm-wide brass caps with a small stem that is bondo'ed® into bedrock. Where no bedrock is available (SN04 and FE05), a 2-m length of rebar® was pounded to refusal.  Small rock cairns are built next to most, and most caps are labelled. Photographic documentation of most sites is included on each sites' web pabe.}

^{The locations of station numbers listed below are by hand-held GPS, and are, as a result, accurate to only 100m or so.  Accurate locations determined by processing of dual frequency receiver data are also on the individual web page.}

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^{SIERRA NEGRA}
 

 

STATION NUMBER	LATITUDE (S)	LONGITUDE (W)
SN01	00 56.84	90 58.43
SN02	00 52.49	91 00.61
SN03	00 50.23	91 04.93
SN04	00 50.71	91 06.95
SN05	00 50.54	91 09.90
SN06	00 48.37	91 05.26
SN07	00 50.49	91 09.01
SN08	00 50.08	91 08.17
SN09	00 48.89	91 07.97
SN10	00 48.66	91 09.65
SN11	00 47.27	91 08.29
SN12	00 47.22	91 06.16
SN13	00 47.10	91 10.01
SN14	00 46.64	91 08.60
SN15	00 46.36	91 06.12
SN16	00 39.82	91 08.73
SN17	00 41.28	91 15.42
SN18	00 48.69	91 08.29
SN19	00 50.32	91 09.94
SN20	00 50.03	91 07.65
SN21	00 47.89	91 07.98
SN22	00 50.43	91 07.62
SN23	00 48.74	91 10.33
SN24	00 48.36	91 08.00
SN25	00 48.86	91 07.62
SN26	00 49.26	91 08.03
SN27	00 49.97	91 08.70

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FERNANDINA

 
 
 
 

STATION NUMBER	LATITUDE (S)	LONGITUDE (W)
FE01	00 18.31	91 39.13
FE02	00 19.35	91 38.28
FE03	00 20.31	91 36.92
FE04	00 21.89	91 34.64
FE05	00 21.92	91 34.10
FE06	00 23.67	91 32.85
FE07	00 23.95	91 33.27
FE08	00 23.59	91 31.38
FE09	00 24.00	91 31.11
FE10	00 22.43	91 30.88
FE11	00 23.23	91 30.80
FE12	00 20.19	91 33.79
FE13	00 20.78	91 33.56
FE14	00 23.77	91 39.02
FE15	00 28.28	91 36.69
FE16	00 26.10	91 23.46
FE17	00 21.37	91 22.94
FE18	00 15.89	91 27.15
FE19	00 17.04	91 31.74
FE20	00 22.42	91 30.36
AL01	00 23.43	91 13.96
DA01	00 17.72	91 21.38