Urban Risk Assessment of Lahar Flows in Merapi Volcano (Study Case: Muntilan Urban Area, Central Java)


Cosmas Bambang Sukatja(1*), Sudibyakto Sudibyakto(2), RPGA Voskuil(3)

(*) Corresponding Author


The objective of the research was to analyse probability of lahar flows occurrence in Muntilan urban area,
Central Java. By using integrated methods, which involve the numerical simulation program, Geographic Information
System (GIS), Remote Sensing (RS) and field verification to produce lahar flows Hazard Map and Risk Map. Muntilan
urban area located at western flank of Merapi volcano, and in down stream of Lamat river. The river is Lahar River that
is endangering from Merapi volcano, which flowing down to cuts a cross of that area. Therefore, Muntilan urban area
is vulnerable area from lahar flows disaster. Lahar flows, generally occur during intense rainfall on saturated volcanic
deposit in upper stream of river or wall of volcano. Lahar flows are extremely dangerous especially to those living in
valley areas near a volcano, which can undercut banks and cause houses destruction situated on the banks, and can
bury and destroy resident, structures, infrastructure facilities including roads and bridges. Meanwhile, development of
Muntilan urban area that caused many illegal settlements appears surrounding that area. Occasionally, un-benefit people
constructing house in disaster prone area, such as down stream of river side that have lahar flows risk. The research was
concluded that lahar flow occurrence in 100 years return period will be buried the Muntilan urban area. With the methods
integrating of GIS, RS, field verification can be done analysing of lahar flows hazard map, and risks map to produce
risk assessment in Muntilan urban area.


lahar flows;urban area;risk assessment

Full Text:



Burrough, P.A., (1989), Matching spatial databases and

quantitative models in land resource assessment.

In: Soil Use and Management, 5(1989)1, pp. 3-8.

ITC Module. (2004), Risk Analisis Using RS/GIS. The


Itoh, H., Miyamoto K., Takahashi M., Takahama J.,

(2000), Hazard Estimation of the Possible Pyroclastic

Flow Disaster Using Numerical Simulation

Related to the 1994 Activity at Merapi Volcano.

Journal of Volcanology and Geothermal Research.

van Westen, C.J. and Daag, A.S., (2005), Analysing the

relation between rainfall characteristics and lahar

activity at Mount Pinatubo, Philippines. Earth surface

processes and landforms : the journal of the

British geomorphological research group, 30(13):


Yamashita, S., (2006), Hazard Map of Sediment Movements

Based on Numerical Simulation and Its

Utilization. Presentation For Sabo Group Course;

Volcanology and Sediment-Related Disaster Management.

JICA Training Course.

DOI: https://doi.org/10.22146/ijg.4991

Article Metrics

Abstract views : 1665 | views : 1875


  • There are currently no refbacks.

Copyright (c) 2014 Indonesian Journal of Geography

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Accredited Journal, Based on Decree of the Minister of Research, Technology and Higher Education, Republic of Indonesia Number 225/E/KPT/2022, Vol 54 No 1 the Year 2022 - Vol 58 No 2 the Year 2026 (accreditation certificate download)

ISSN 2354-9114 (online), ISSN 0024-9521 (print)