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Stefanos Crater

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description Stefanos Crater Overview

Stefanos Crater is a prominent hydrothermal volcanic formation located within the main caldera on the Greek island of Nisyros. It is a phreatic crater, meaning it was formed by explosive steam eruptions rather than the direct ejection of magma. The crater floor features an active fumarole field where continuous jets of sulfur-rich steam vent from the earth, producing distinct yellow mineral deposits and intense heat. Easily accessible to visitors, it represents the primary surface expression of the island's underlying active volcanic system.

help Stefanos Crater FAQ

Can visitors walk inside Stefanos Crater on Nisyros?

Visitors are generally able to descend on foot onto the crater floor when local conditions and access rules permit. The ground is uneven and hydrothermally active, so marked routes and posted warnings should be followed.

What causes the sulfur smell at Stefanos Crater?

Hot gases and steam rise through fumaroles in the crater floor, carrying sulfur compounds that produce the characteristic odor. Yellow mineral deposits can form around the vents.

Is Stefanos the main volcanic crater on Nisyros?

Stefanos is the island's best-known and most accessible hydrothermal crater within the larger Nisyros caldera. It is not the entire volcano, but one feature of a broader active geothermal system.

When did Nisyros last erupt?

The island's most recent documented eruptive or explosive hydrothermal activity occurred in the late 19th century. Fumaroles, hot ground and seismic unrest show that the volcanic system remains active even without flowing lava.

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