How to Navigate

Draw rectangle on map to select stations, zoom in/out to focus on regions, then click on the station in the sidebar to see realtime slant TEC. Station background noise level from the last 24 hours is shown as (L) - Low (<0.05TECU), (M) - Medium (0.05-0.15 TECU), (H) - High (>0.15 TECU) , or (NA) - Not Available. Click here for global noise statistics for the last eight weeks.

Data Availability

Near-real-time TEC data from GUARDIAN are available through the NASA Crustal Dynamics Data Information System (CDDIS)

Legend

GPS

GPS

GLONASS

GLONASS

GALILEO

GALILEO

BEIDOU

BEIDOU

Earthquake

Earthquake

USGS Tsunami Watch

USGS Tsunami Watch

GDGPS Station

GDGPS Station

Archive

Generic GUARDIAN map

Yesterday

Explore data from yesterday at midnight UTC.

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Generic GUARDIAN map

Two Days Ago

Explore data from two days ago at midnight UTC.

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Explore Examples

GUARDIAN Map of the Kahramanmaraş Earthquake Sequence

2023 Kahramanmaraş Earthquakes

On the 6th of February 2023, two high-magnitude earthquakes (7.8 and 7.5) struck the Kahramanmaraş region (Republic of Türkiye), leading to more than fifty thousand deaths in the Republic of Türkiye and Syria.

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GUARDIAN Map of the 2022 Hunga Volcano Eruption

2022 Hunga Volcano Eruption

The Hunga volcano on the islands of Hunga Tonga and Hunga Ha’apai erupted on January 15, 2022, producing the largest ionospheric signal ever observed. Atmospheric waves produced by the eruption circled the globe several times.

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GUARDIAN Map of the 2017 Geomagnetic storm

2017 Geomagnetic Storm

On September 7-8, 2017, a severe geomagnetic storm (Kp ~8) triggered severe ionospheric disturbances. These disturbances caused severe disruptions in satellite navigation and radio communication, and are visible in the noise in TEC time series around the world.

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GUARDIAN Map of the 2012 Haida Gwaii Tsunami

2012 Haida Gwaii Tsunami

On October 27, 2012 an earthquake of moment magnitude 7.8 occurred on the Haida Gwaii archipelago off the west coast of Canada. A tsunami alert was issued in the US State of Hawaii and over 100,000 people were evacuated. Gravity waves from the tsunami reached the ionosphere hours before the tsunami reached the coast of Hawaii.

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link to GDGPS

Powered by the JPL Global Differential GPS (GDGPS) System