![]() ![]() The video below shows some of the recent activity at Poás Volcano from the Observatorio Vulcanológico y Sismológico de Costa Rica (OVSICORI)Īnother aspect of Poás that makes it unique are its two crater lakes. Therefore, eruptions of Poás appear to never be very large in scale. This scale goes from 0 to 8, with 0 representing a very minor Hawaiian-like eruption, while an 8 would be an eruption of a supervolcano like Yellowstone. Furthermore, by examining the eruptive history of Poás on the Smithsonian Global Volcanism Program website, we learned that there have been several other eruptions prior to 1910, none of which exceeded a volcanic explosivity index (VEI) of 2. de Moor, we learned that, “the last time that Poás had a phreatomagmatic eruption similar to this was in 1953, and before that in 1910.” It is because of this that he deemed the activity out of the ordinary. While those eruptions, which occurred on-and-off for a period of eight years were purely steam eruptions, the activity that started in April has also involved magma. Such events can either be precursors to larger eruptions or can stand along. These happen as groundwater quickly turns to steam as it is heated by magma. A phreatic eruption is a steam eruption, which means that no lava is expelled. ![]() The largest of these eruptions created columns greater than 300 m high. In terms of its eruptive history, Poás most recently underwent a period of phreatic activity, beginning in 2006, and commencing in 2014. This type of volcano typically has steep slopes and will periodically undergo explosive and effusive eruptions. Stratovolcanoes, also known as composite volcanoes, are formed by layers of lava, tephra, pumice, and ash. ![]() Poás is a stratovolcano approximately 20 km from the city of San Jose, the capital of Costa Rica, and home to a little over 300,000 people. This also shows Laguna Botos, the lake in a crater that last erupted 7,500 years ago, and Laguna Caliente, one of the most acidic lakes in the world. This Google Earth image shows the craters of Poas Volcano. Because of this we thought we’d take a closer look at this volcano, which is visited by over 300,000 people per year. Maarten de Moor (Observatorio Vulcanologico y Sismologico de Costa Rica). Even though it is one of the most active volcanoes in Costa Rica, the current activity is considered “out of the ordinary” by to Professor J. Since April, Poás volcano in Costa Rica has been experiencing significant unrest, which has included several small eruptions, that has forced the closure of Poás Volcano National Park. San Cristóbal volcano, is located 95 miles northwest of Managua.By David Jacobson, Temblor Poás Volcano in Costa Rica has been experiencing unusual activity since April, which has forced the closure of Poás Volcano National Park, which draws up to 300,000 people per year. Nicaragua has a total of 28 volcanoes, of which seven are active. When the eruption of the San Cristóbal volcano is strong, it generally affects the municipalities of Chichigalpa, Corinto, El Realejo, El Viejo and Chinandega (departmental capital of the same name). The entity considers that the increase in the volcanic activity of San Cristóbal is for the moment “part of its normal behavior” and did not rule out that “new explosions of similar or smaller magnitude to those registered” this Sunday “may occur”. San Cristóbal, 1,745 meters high, is located in the department of Chinandega and is part of the volcanic chain of the Pacific region of Nicaragua.Īccording to Ineter, during the volcanic explosion “the volcanic tremor and the real time seismic amplitude (RSAM)” presented “an increase” that later returned “to its usual values”. However, the volcano’s activity was of “moderate intensity” and did not cause major damage to nearby towns, it said. The San Cristóbal volcano, the highest and most active peak in Nicaragua (northwest), registered this Sunday an explosion of gases and ashes up to 1,500 meters high that spread over three neighboring communities, informed an official source.ĭuring the explosion, “the ash column reached a height of 1,500 meters above (the) crater of the volcano that due to the effect of the wind” reached with “a small layer of ashes the communities Las Grecias 3, Las Grecias 4 and the city of El Viejo”, indicated the Nicaraguan Institute of Territorial Studies (Ineter) in a communiqué.
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