September 13, 2023

Updated: Tuesday, September 26; 1:45 PM EST

Data Updates & Reports

Note: All reports can be found on CrisisReady’s organization page on ReliefWeb.

Tuesday, September 26, 2023

This report provides an assessment of minor and major damages in Derna, Libya. The visualization compares data from Google’s machine learning model for post-disaster damage assessment and satellite imagery.

More information on Google’s data assessment model can be found here.

Key Observations:

  • The probability of minor damage to infrastructure affects a much larger area of Derna than the possibility of major damage.
  • Buildings within 0.3 km2 hex tile areas has a 39% chance of suffering minor damage and a 9% chance of suffering major damage.
  • Major damage was disproportionately concentrated within the immediate flood areas.
  • Minor damage was distributed throughout Derna.

Monday, September 25, 2023

This report provides an overview of Google’s machine learning-derived damage assessment data in Libya, particularly in the regions most affected by recent floods.

More information on Google’s data assessment model can be found here.

Key Observations:

  • Damage assessment data from Google, focusing on the probability that buildings have been destroyed or suffered major damage, indicates potential serious impacts on healthcare facilities in Derna.
  • Two clinics in the central area of Derna likely faced significant damage.
  • Two pharmacies and the public hospital are in zones with a low probability of major damage.
  • Healthcare facility data was sourced from

Tuesday, September 19, 2023

This report provides information on population displacement dynamics, network outages, and healthcare infrastructure in the regions of Libya most affected by floods, especially Derna.

Key Observations:

Increases in Population Densities

  • On the 17th of September, the Darnah district recorded a +22% rise in population density compared to its pre-crisis baseline.

Decreases in Population Densities

  • Between the 18th and 19th of September, a sharp decrease in Facebook users was observed in Barnah province, especially in the city of Derna.
  • During the night of the 18th, Darnah’s population density rate dropped to -48%, then slightly rose to -42% on the 19th.
  • The overall population in Darnah went down from over 17,000 users on the 17th of September to just above 4,600 by the 19th.
  • The city of Derna appears to be the hardest hit, with only a few current Facebook users detectable.

Network Status and Outages

  • The primary reason for the significant decline in users in Darnah seems to be a massive network outage, affecting user count in mobility datasets.
  • Reports suggest that network services to the area, particularly Derna, have been disrupted.
  • Other regions in eastern Libya remain unaffected by these outages.

Sunday, September 17, 2023

This report provides information on population displacement dynamics and healthcare infrastructure in the regions of Libya most affected by recent floods. Changes in population density were analyzed using Facebook mobility data collected on September 17 against a 90-day pre-crisis baseline.

Key Observations:

General Updates

  • Most shifts in population can be attributed to uninhabitable areas post-flood and efforts related to relief and debris clearance.

Increases in Population Densities

  • Most regions of Bayda city show an increase in population density between 10% and 50%.
  • In and around the Al Abraq International Airport, there’s a significant rise in population density, seeing increases of 75% or more.
  • Darnah, housing the most affected city of Derna, has experienced population movement rates above 50% compared to the baseline, notably to districts like Benghazi, Al Marj, and Al Butnan.
  • Cities on the northern road in Al Butnan, extending from Derna to the Egyptian border, have observed population density increases ranging between 10% and 50%.

Decreases in Population Densities

  • Coastal regions from Derna to El Akhrab have seen a decrease in population densities compared to the baseline.

Thursday, September 14, 2023

This report provides insights into the population displacement dynamics and healthcare infrastructure in the regions of Libya most affected by recent floods. The report pays special attention to changes in population densities registered on Thursday, September 13.

Key Observations:

General Updates:

  • The Libyan Red Crescent estimates the death toll from the northeastern Libya flooding could reach up to 20,000 people.

Increases in Population Densities:

  • Population metrics from Facebook users show an increase in affected areas, particularly since the flood’s peak on Sept. 10th.
  • As of Sept 14th, Darnah’s population is 10% above the 90-day pre-crisis baseline, likely due to the influx of aid and rescue personnel.
  • Conversely, inland areas, especially in the Bayda district, report population increases ranging from +10% to +50%.

Decreases in Population Densities:

  • Coastal regions have experienced a population decrease of up to 75% compared to baseline.

Health Infrastructure:

  • Derna’s health infrastructure has been severely compromised, with almost all clinics situated within the flood’s most severely affected zone. Only one clinic remains operational.

Wednesday, September 13, 2023

This report provides insights into the population dynamics and healthcare infrastructure in the aftermath of the devastating flooding in northern Libya, especially in the coastal city of Derna.

Key Observations:

  • Population Changes in Darnah District:
    • Population declined by 40% as of September 13th.
    • Coastal city of Derna, where massive flooding occurred, saw declines of up to 100%.
  • Potential Displacement Areas:
    • Significant population increases detected in cities around Derna: Martubah, Umm ar Rizam, Al Bomba, Timimi, and Tubruq.
  • Population Increase in Surrounding Districts:
    • Each district around Derna noted significant population growth.
    • The highest increase, +30%, was observed in Benghazi.
  • Health Infrastructure in Darnah Province:
    • Only two hospitals and three outpatient facilities, as per
    • Data based on open sources and may differ from official records.

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