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Did You See It? | Crowdsourcing Landslide Information

Case Study Overview

A screenshot of an interface for reporting a landslide through Did You See It? Website

Screenshot of an interface for reporting a landslide through Did You See It? 

Landslides occur in all 50 states, costing lives and billions of dollars in damage each year. Although no federal agency systematically tracks landslide occurrence, the information is needed to test landslide hazard models and improve our understanding of landslides and their impacts.

In response, the U.S. Geological Survey’s Landslide Hazards Program developed Did You See It?, an interactive website that people can use to report landslides. Patterned after Did You Feel It? (the USGS website for reporting earthquakes), the site collects landslide information from across the United States. It allows ordinary citizens to make observations that can be used to classify landslides and characterize any damage they cause.

Download this case study (PDF, 115KB)
Website: Did You See It? 

Project Description

screenshot of Report a Landside interface

Screenshot of the interface for selecting the location of a landslide reported in Did You See It?

Did You See It? lets citizens report when and where they observed a landslide, and it prompts them to classify the landslide by movement type. Users can also report damage and casualties as well as the landslide’s dimensions. In addition, they can make simple geological observations and submit photographs.

Once a user submits a report, the location of the landslide appears on a map, linked to a summary of submitted data. Project staff review any photos submitted before posting them on the website.


Obtaining a precise location for a landslide can be a challenge if there is no address for it (common in rural areas) and if the user lacks GPS capability. Moreover, multiple users might submit conflicting data for the same landslide. Getting the word out about Did You See It? can be difficult; the project is doing so using social media. Adapting the website for efficient use by mobile devices is yet another challenge.

Benefits and Outcomes

A primary benefit of Did You See It? is expanded public awareness of landslides. Interacting with the website encourages users to learn more about the science of landslides.

La Conchita landslide near Ventura, California in 2005

La Conchita Landslide near Ventura, California, in 2005. Photo credit: U.S. Geological Survey.

In addition, researchers can use the website for the information they need to estimate landslide damages, improve landslide inventories, and define and test rainfall criteria for early warning. The information on the website can also help in disaster response.

The Did You See It? project has generated 59 reports of landslides from people across the United States, including three reports in 2015. Thirteen reports were from California, Oregon and Washington, and another 16 were from states east of the Mississippi River. Sixteen reports included photographs of the reported landslides.


The Did You See It? case study illustrates the following steps in the Federal Citizen Science and Crowdsourcing Toolkit:

  • Scope Out Your Problem — Know Your Tools
    Did You See It? shows the public that more information about landslides is needed and that the problem of landslides is not well understood.
  • Build a Community — Know Your Community Partners
    Did You See It? can be used by others, including the emergency response community, state geological surveys and academic partners, to better understand and respond to geologic hazards while raising public awareness about them.
  • Sustain and Improve — Evaluate the Quality of Your Data; Evaluate Your Participants’ Engagement
    The management plan for Did You See It? provides a process for improving ease of use and the accuracy of information collected.



Contact Information

Rex Baum