ISS021-E-23475

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Spacecraft nadir point: 14.2° N, 88.7° W

Photo center point: 13.7° N, 89.0° W

Nadir to Photo Center: Southwest

Spacecraft Altitude: 182 nautical miles (337km)
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Image Caption: Lake Ilopango, El Salvador

The Central American country of El Salvador occupies a land area nearly the same size as the U.S. State of Massachusetts, and it includes numerous historically active volcanoes. This detailed astronaut photograph highlights the Ilopango Caldera that is located approximately 16 kilometers to the east of the capital city, San Salvador. Calderas are the geologic record of powerful volcanic eruptions that empty out a volcano's magma chamber; following the eruption, the overlying volcanic structure collapses into the newly formed void, leaving a large crater-like feature (the caldera).

The last caldera-forming eruption at Ilopango occurred during the fifth century AD; it was a powerful event that produced pyroclastic flows that destroyed early Mayan cities in the region. Later volcanic activity included the formation of several lava domes within the lake-filled caldera and near the shoreline. The only historical eruption at Ilopango took place in 1879-80. This activity resulted in the formation of a lava dome in the center of Lake Ilopango. The summit of the dome forms small islets known as Islas Quemadas (visible as small white dots in the larger image). The city of Ilopango borders the lake to the west (image left), while green, vegetated hills ring the rest of the shoreline. White, patchy cumulus clouds are also visible in the image (center and upper left).