Indonesia: Authorities maintain "orange" alert level at Mount Merapi in Central Java as of Jan. 20 /update 1

Event

Authorities continue to maintain an "orange" alert level, the second-highest rating, at Mount Merapi in Central Java Province as of Jan. 20 following heightened volcanic activity in recent days. The volcano erupted Jan. 20, producing lava that flowed as far as 1 km (0.6 miles) southwest of the summit; officials have warned that lava flows could affect areas as far as 5 km (3.1 miles) from the peak. Hundreds of locals have self-evacuated since early January, though some have returned to the area following a reduction in volcanic activity. Authorities may issue official evacuation orders in the coming days.

The volcano is around 29 km (18 miles) north-northeast of Yogyakarta.

Flight disruptions may occur at Yogyakarta's Adisutjipto International Airport (JOG) if additional significant eruptions occur and produce significant ashfall. Minor delays are also possible on other routes in the region if planes detour around ash clouds. Authorities may impose ground travel restrictions along roads in affected areas, as ash could reduce visibility and make streets slippery. Localized ground traffic disruptions are possible.

Health
Volcanic activity may impact air quality in the areas of Central Java surrounding Mount Merapi. Air quality could become a concern, particularly in areas near the crater, following any 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.

Advice

In the event of further eruptions, contact airlines for updated flight information; confirm flights before checking out of hotels or driving to the airport. Avoid areas with heavy ash accumulations. If operating in areas affected by the ash cloud, consider remaining indoors in air-conditioned facilities when possible. Those who must be outdoors should use protective face coverings and observe other precautions to avoid ash inhalation. Drive defensively; seek updated information on road conditions before driving or routing shipments through areas close to the volcano. Follow official instructions.

Resources

MAGMA Indonesia
Center for Research and Development of Geological Disaster Technology (BPPTKG) Twitter page (Indonesian)