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  • Primary Volcano Type
  • Last Known Eruption
  • 10.73°N
  • 103.58°W

  • Unknown

  • 334040
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The Global Volcanism Program has no activity reports for Unnamed.

The Global Volcanism Program has no Weekly Reports available for Unnamed.

Index of Monthly Reports

Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

10/2005 (BGVN 30:10) November 2003 visit finds evidence of very recent eruption

Contents of Monthly Reports

All information contained in these reports is preliminary and subject to change.

10/2005 (BGVN 30:10) November 2003 visit finds evidence of very recent eruption

In a recent publication, Rubin and van der Zander (2005) discuss radiometric methods for dating lavas as one means to establish eruption chronologies. Some of their techniques were applied to samples of fresh lava (erupted September-October 2003) found on the East Pacific Rise (EPR) at 10°44'N (Voight and others, 2004). This location lies ~ 1,900 km WNW of the Galápagos Islands. During a November 2003 biological sampling visit to the EPR at 10°44'N, divers in the submersible Alvin expected to be revisiting an established hydrothermal vent field. Instead, they found indicia all of which were consistent with a recent eruption, notably fresh lava, bacterial mats, and diffuse snow- blower vents issuing from lava collapses. The team acted immediately after the cruise by sending the lava samples to the University of Hawai`I for dating. Researchers there determined that an eruption had occurred within 1 to 2 months prior to the site visit. A hydrophone array (designated N-EPR) nominally monitored this part of the EPR since 1996, but not in real time. Unfortunately, the system failed to record data during the 2002-2004 interval due to a hardware problem.

Ages for lavas erupted within the past 1.5-2 years were determined with the 210Po-210Pb dating method (Rubin and others, 1994). To use this method, analyses should begin as soon as possible after samples are collected from suspected eruption locales. Radioactive disequilibrium is largest, and temporal resolution of the method is highest, immediately following eruption. According to Rubin and van der Zander (2005, p. 28) "Polonium is volatile at magmatic temperatures and degasses from magmas when they erupt. This creates an initial 210Po (half-life = 138.4 day) deficit relative to grand parental 210Pb in freshly erupted magmas. This deficit is subsequently erased with time via radioactive ingrowth toward secular equilibrium."

References. Rubin, K.H., Macdougall, J.D., and Perfit, M.R., 1994, 210Po-210Pb dating of recent volcanic eruptions on the seafloor: Nature, v. 368, p. 841-844.

Rubin, K., and van der Zander, I., 2005, Obtaining high-resolution chronologies of submarine lava eruptions: Better dating through radiochemistry: Ridge 2000 Events, v. 3 (Spring 2005), p. 28-30.

Voight, J. R., Zierenberg, R.A., McClain, J., and the Science Party: Batson, P., Beers, K., Daly, M., Dushman, B., Gollner, S., Govenar, B., Haney, T.A., Hourdez, S., Liow, L.H., Parker, C., Von Damm, K., Zekley, J., and Zelnio, K.A., 2004, FIELD cruise to the northern EPR: Discoveries made during biological investigations from 8°37'N to 12°48'N: Ridge 2000 Events, v. 2(1), p. 22-24.

Information Contact: Ken Rubin, Department of Geology and Geophysics, SOEST, University of Hawai`I, 1680 East West Road, Honolulu, HI 96822, USA (Email: krubin@hawaii.edu).

Divers in the submersible Alvin discovered an extremely fresh lava flow in an unexpected location at 10 degrees 44 minutes North on the East Pacific Rise during an expedition in November 2003. The young flow was covered by bacterial mats, had large amounts of bacterial floc ("snow-blowers") issuing from diffuse vents, and was sparsely populated by small animals. Uranium-series dating indicated that the eruption had taken place within a time window only a few months to weeks prior to the observations. This segment of the East Pacific Rise, located just north of the Clipperton Transform Fault, is an area with an estimated low magma production rate.

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2003 May (?) 2003 Nov Confirmed 0 Historical Observations

The Global Volcanism Program has no synonyms or subfeatures listed for Unnamed.

A low-temperature probe from the submersible vehicle Alvin is inserted into a "snow-blower" located in a collapse structure at 10 degrees 44 minutes N on the East Pacific Rise. The maximum temperatures reached only 9.5 degrees Centigrade. This extremely fresh lava flow was erupted within only a few weeks to a few months of an expedition in November 2003. The flow was covered by bacterial mats, had large amounts of bacterial floc ("snow-blowers") issuing from diffuse vents, and was sparsely populated by small animals.

Photo courtesy J.R. Voight, 2003 (Ridge2000, National Science Foundation).

The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Rubin K, van der Zander I, 2005. Obtaining high-resolution chronologies of submarine lava eruptions: better dating through radiochemistry. Ridge 2000 Events, 3 (Spring 2005): 28-30.

van der Zander I, Rubin K H, Zierenberg R A, Voight J R, von Damm K, McClain J, 2004. 210Po-210Pb dating and U-series disequilibria of a young basaltic flow at 10° 44' N EPR. Eos, Trans Amer Geophys Union, 85(47): abstract B13A-0178.

Volcano Types

Fissure vent(s)

Tectonic Setting

Oceanic crust (< 15 km)

Rock Types

Basalt / Picro-Basalt


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Affiliated Databases

Large Eruptions of Unnamed Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.