2020 Aegean Sea Earthquake

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General Information

2020 Aegean Sea Earthquake is a page documenting the response of the local Turkish community supported by the Humanitarian OpenStreetMap Team (HOT) regarding the magnitude 7.0 earthquake which struck on Friday, 30 October 2020, about 14 km (8.7 mi) northeast of the island of Samos, Greece.

For Aid Organizations

Map and Data Services

About OpenStreetMap

OpenStreetMap offers an online map (and spatial database) which is updated by the minute. Various tools and services allow data extracts for GIS specialists, Routable Garmin GPS data, Smartphone GPS navigation, and other device-compatible downloads. With an internet connection, regular syncing is possible with open access to the community contributed data as it comes in, with OpenStreetMap's bulk data downloads ideal for use offline. In addition, maps can also be printed to paper.

Browse the Activation Area to get a feel for the data that is currently available. Different map styles including an Humanitarian style can be selected on the right side, and some data may not render (appear) on the map, but could be exported from the underlying database (See export section below).

Paper Maps

Poster size Maps and normal sized paper atlases of custom areas can be printed:

  • See OSM_on_Paper for an overview and list of platforms and services for printing maps.
  • We suggest FieldPapers Paper Maps with grid for field survey or general navigation purposes.

Exporting OpenStreetMap data

See Downloading data for instructions on getting large scale map data, or see the focused exports below:

Offline Road Navigation with small devices

With the availability of Small communication devices, Navigation Offline data proves to be very useful to the humanitarians deployed in foreign countries. We support the humanitarian NGO's using navigation data and invite them to give us feedback on the utilization of these devices in the context of field deployment.

  • See Software/Mobile for more information on using OSM in portable devices.
  • See also Mobile Mapping on LearnOSM.org for information on mapping in the field.

Usage of OSM data for Humanitarian Missions

About This Disaster Activation

About HOT

Hot logo with text.svg
  • To learn more about the Humanitarian OpenStreetMap Team (HOT), explore more of our wiki-pages (root: HOT) or our website hotosm.org. We are a global community of mostly volunteers, we are also a US Nonprofit able to contract with organizations (email info at hotosm.org to contact our staff), we are also a 501-c-3 charitable organization.

History of this Activation

Reactivity of the OSM Community

  • October 30, 2020 - Following the event, Yer Çizenler have coordinated with the Izmir branch of the Chamber of Survey and Cadastre Engineers (HKMO Izmir) and planned field mapping activities to document the earthquake damage to buildings.

HOT Activates to Support Local Team

  • October 30, 2020 - Activation leads have coordinated with Yer Çizenler team via HOT's communicaiton channels. Discussion revealed that the affected areas were densely populated and the regions were partially mapped.
  • October 31, 2020 - Yer Çizenler and HKMO Izmir have visited the most affected regions, Bornova and Bayraklı, to document mainly the collapsed buildings. Another field campaign is exclusively planned for documenting damaged buildings.


  • Local Lead(s): Can Ünen, Orkut Murat Yılmaz, Oğuzhan Er
  • HOT Support Team: Russell Deffner, Toni Ros Martinez

Support Team

Support team member(s): Özhan Kaynarca, Sercan Yalçınkaya

Effort made

  • By November 10, 2020 - 352 mappers had made 524,489 changes to OpenStreetMap, creating 67,740 buildings and 1,128 road segments (source)
  • At the beginning of February, the time the response concluded officially, 695 contributors had added just under 322,000 features to OpenStreetMap including nearly 282,000 buildings. (source)

Collaborative Initiatives

  • Yer Çizenler is a local NGO based in Istanbul, as part of the Turkish OpenStreetMap community. Key activities include advocacy and community building efforts in Turkey on free and open source software, open geospatial data and related tools, mostly within the OpenStreetMap ecosystem.
  • HKMO Izmir is the local chapter of the National Chamber of Survey and Cadastre Engineers, who were part of the regional coordination assembly put together for response and relief coordination.
  • Mapillary will be used to collect 'street-view' imagery of the damage, in turn used by agencies and organizations to estimate damage and coordinate relief efforts. The images captured can also be used to help improve the mapping in OpenStreetMap.

For Mappers

  • Local Community welcomes continuation of the following projects but the data needed is complete.

How You Can Contribute

Learn to Map

  • Most of our volunteer needs are for remote OSM contributors, visit LearnOSM.org to get started.

Mapping Priority

  • Please choose from highest priority first
  • Experienced mappers are also asked to participate in validating completed tasks. Information on validating can be found here
Project Priority Location What to map Imagery Source Task Mapping Status Task Validation Status
Turkey, Izmir Earthquake Response (M=7.0) Urgent Izmir City Center with priority reigons: Bayraklı and Bornova Buildings, Roads MAXAR 94% 66%
Turkey, Izmir, Seferihisar Tsunami Response (M=7.0) High Seferihisar and Urla, with priority on the coastal region on the south, affected from the tsunami Buildings, Roads MAXAR 56% 52%

Available Imagery

OSM Default Imagery Sources


Maxar Premium is generally available, minus a few cloudy spots, and is quite recent; use this as the general go-to imagery. The post-event imagery is more difficult to use due to offset and angle (off-nadir) though you are welcome to use it, see 'Alternative Imagery Sources' below for instructions.


Bing provides a global imagery data source that is the 'default' Imagery available for OSM (default option in most editors). Use this where MAXAR is cloudy.

Alternative Imagery Sources

MAXAR Open Data Program

MAXAR has shared the pre and post event imagery through its Open Data Program and the imagery have been made available via OpenAerialMap for OSM editing. The imagery is more difficult to use due to cloud cover. So referring to default MAXAR Premium is suggested when necessary.

How to add/use Alternative Imagery

In many cases better imagery is available than the default; when possible we set up a remote link directly via the Tasking Manager, so there is nothing to do, the iD editor and (as long as enabled) JOSM will automatically add the imagery.

Additionally, with JOSM, it's relatively easy to add special imagery if the license is appropriate for tracing into OSM. For more details see JOSM Imagery Help