Costa Rica: Increased volcanic activity at Turrialba Volcano in Cartago Province as of early Jan. 19; authorities warn residents of ashfall

Event

The Volcanological and Seismological Observatory of Costa Rica (OVSICORI) has observed increased levels of volcanic activity at Turrialba Volcano, located approximately 35 km (22 miles) east of San Jose City. Two eruptions occurred late Jan. 17, with the latter one emitting an ash cloud around 1,000 meters (3,280 feet) above the crater. The eruption is the most significant in the past four years. Prevailing winds have blown the ash west, affecting the greater San Jose metropolitan area. Ash has been reported in Alajuelita, Coronado, Desamparados, Goicoechea, Moravia, Pavas, Santa Ana, and downtown San Jose cantons.

The National Commission for Risk Prevention and Emergency Attention of Costa Rica (CNE) has advised residents to be vigilant for additional eruptions and to abide by instructions and orders from the authorities. The CNE has also advised those with respiratory problems to take necessary precautions to avoid the ash. Additional eruptions could cause low-level seismic activity, ash clouds, and landslides in the surrounding area.

Health
Further volcanic activity may impact air quality in central Costa Rica. Air quality could become a concern, particularly in areas near the crater following an explosive event. Individuals in the region - especially those with underlying pulmonary conditions such as asthma, chronic obstructive pulmonary disease (COPD), or lung cancers - may experience difficulty breathing and could suffer from lower tolerance to physical exertion.

Transport
Road conditions could quickly deteriorate during periods of significant ashfall, and visibility could be reduced. Officials might close roads near the volcano depending on the presence of hazardous volcanic material. Fine particulate matter ejected from the volcano could pose a hazard to flights in the surrounding airspace; as of early Jan. 19, flights at Juan Santamaria International Airport (SJO) and Tobias Bolanos International Airport (SYQ) are operating normally. Authorities may temporarily close airport facilities if significant ashfall accumulations occur.

Advice

Confirm flights if a large eruption occurs. Plan for possible transportation disruptions if operating near the volcano over the coming days. Seek updated information on road conditions before driving; due to reduced visibility, drive cautiously in areas affected by ash. Carry facemasks and observe other precautions to avoid ash inhalation if operating in the affected area.

Resources

National Commission for Risk Prevention and Emergency Attention of Costa Rica (CNE) (Spanish)
Volcanological and Seismological Observatory of Costa Rica (OVSICORI) (Spanish)