Earthquake

InaSAFE Earthquake Realtime

The InaSAFE Realtime Earthquake page contains near real time earthquake impact assessments following recent earthquakes in the Indonesian region. Shakemaps of earthquake ground shaking are produced by the Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) and used by the Indonesian National Disaster Management Agency (BNPB) to produce InaSAFE impact assessments within minutes of an earthquake. This information is used by disaster managers to help them understand the potential scale of a disaster and to respond faster to the hardest hit communities. This is particularly important in the first few hours after a large earthquake when it may be difficult to get accurate on-the-ground information.


The InaSAFE Realtime Earthquake platform allows users to see a list and map of all earthquake events for which a shake map has been received from the Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG). Earthquake events can be sorted or filtered by size and date. Users can zoom to an earthquake event and open the analysis report. The platform also allows users to download pdf report, the original shake map (grid xml) and the MMI output as raster and contour data. The grid xml file can be converted using the shakemap converter  in the desktop version of InaSAFE and  used for further analysis .


The InaSAFE Realtime Earthquake report shows details of the earthquake event such as the magnitude, date, time, location and depth with the results of the InaSAFE Realtime Earthquake analysis. The InaSAFE Realtime Earthquake analysis estimates the number of people exposed by each MMI level using modelled population exposure data from World Pop. The analysis report also lists nearby places (district capitals) based on place names from Badan Informasi Geospasial (BIG) with an estimate of the urban population using Badan Pusat Statistik (BPS) 2010 population census data. InaSAFE Realtime Earthquake uses a distance and direction algorithm to identify the closest populated place. InaSAFE Realtime Earthquake analysis uses the ITB bayesian fatality model to estimate the number of fatalities for each earthquake event. The fatality calculation assumes that no fatalities occur for shake levels below IV and fatality counts of less than 50 are rounded down.


Notes:

  • The Modified Mercalli Intensity (MMI) scale describes the intensity of ground shaking from an earthquake based on the effects observed by people at the surface.
  • The ITB bayesian fatality model was developed by Institut Teknologi Bandung (ITB) in 2012 and  is the most up to date earthquake impact model.

 

Limitations:

  • The extent and severity of the mapped event may not be consistent with the actual event.
  • Earthquake fatalities are due to a number of factors, such as destructive level of ground shaking, tsunami, landsliding and fire. The ITb bayesian fatality model only considers the number of fatalities due to the earthquake ground shaking and does not include losses due to secondary hazards.
  • The fatality models in InaSAFE do not estimate number of injuries or displaced people.
  • The ITB fatality model is based on fatality rates from a limited number of past fatal events. It is known to overestimate fatality rates at MMI levels greater than VIII. It does not include a measure of uncertainty.
  • Exposed population varies by the time (day or night, weekends, holidays etc.). Such variations are not considered in the estimates in InaSAFE.
  • The actual impact on people may differ from the analysis results due to limitations in the accuracy of the data, the analysis model and the behaviour of the local population.
  • For this reason, decisions should not be made solely on the information presented here and should always be verified by ground truthing and other reliable information sources.


More information:

For more information on the earthquake impact assessment in InaSAFE please refer to the online manual