• 'Nieve Penitentes'

    'Nieve Penitentes' on top of Kilimanjaro

    (courtesy G. Kaser)

  • Earth's gravity field models

    Improvement of the Earth's gravity field models (from top left to bottom right): Best gravity field model before CHAMP and GRACE; Gravity field from CHAMP; Gravity field from GRACE; Gravity field from GRACE combined with terrestrial data

    (courtesy C. Reigber)

  • Jovian atmosphere

    Eddies and red spot in the Jovian atmosphere.

    Huygens-Cassini mission, December 2000; credit: NASA and JPL

  • Water level measurements

    Water level measurements of a reservoir constructed to store seasonal rainfall for domestic use, animal watering and small-scale irrigation in Zimbabwe

    (courtesy P. Hubert)

  • Condensation trail

    Unstable rings of condensation trail viewed from research aircraft.

    Photo: Christiane Voigt

  • The microstructure instrument

    The microstructure instrument is ready for decent from the aft deck of the Swedish icebreaker Oden during the Beringia 2005 expedition. This instrument measures salinity, temperature and velocity with very high vertical resolution (cm) in the water column and can resolve features of the smallest vertical scale

    (courtesy J. Rohde)

  • Seismicity of the Earth

    Seismicity of the Earth, 1960-2012, magnitudes greater than 6. Colored circles mark the earthquake depths and their size the magnitude of the events

    (Figure by A. Ismail-Zadeh; using SeismicEruption by A. Jones)

  • Etna volcano lava flow

    Etna volcano lava flow, Sicily, Italy

    (photo by B. Behncke)

  • Testing ice strength

    Testing ice strength in Spitsbergen, Norway

    (courtesy E. Morozov)

  • Satellite gradiometry

    Satellite gradiometry is used to study the Earth's gravity field and ocean circulation

    Source: ESA

  • Scalar magnetic anomaly map

    Scalar magnetic anomaly map of the Earth

    (courtesy S. Maus)

  • 2011 flooding in Queensland, Australia

    2011 flooding in Queensland, Australia; left: before the event on 14 December 2010, and right: after the event on 4 January 2011

    (source: H. Riebeek, NASA/GSFC)

  • Arcs of cirrus clouds

    Arcs of cirrus clouds above fog layer to the north of the Alps

    Seviri instrument on Meteosat, 15 January 2010; credit: Eumetsat and DLR

  • Storm in the Drake Passage

    Storm in the Drake Passage, between the southern tip of South America and the South Shetland Islands of Antarctica

    (cortesy E. Morozov)

  • Land uplift

    New land is emerging from the sea in Finland due to the post glacial rebound effect

    (Courtesy of the Finnish Environmental Institute - FEI)

  • Volcanoes

    From left to right: Bezymianny, Kamen, and Klyuchevskoy volcanoes in Kamchatka, Russia

    (source: A. Belousov)


The International Union of Geodesy and Geophysics (IUGG) is the international organization dedicated to advancing, promoting, and communicating knowledge of the Earth system, its space environment, and the dynamical processes causing change.

Through its constituent Associations, Commissions, and services, IUGG convenes international assemblies and workshops, undertakes research, assembles observations, gains insights, coordinates activities, liaises with other scientific bodies, plays an advocacy role, contributes to education, and works to expand capabilities and participation worldwide.

International Cooperation in Geodesy and Geophysics


IUGG100 Website launched

Meetings are subject to change due to COVID-19 pandemic. Updates will be available soon.

AOGS 18th Annual Meeting
August 1-6, 2021

International Conference on the Status and Future of the World’s Large Rivers
August 2-6, 2021
Moscow, Russia

International Conference on Clouds and Precipitation
August 2-6, 2021
Pune, India

25th Congress and General Assembly of the International Union of Crystallography
August 14-22, 2021
Prague, Czech Republic

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