# How to use Quakes99

Explore significant earthquakes by magnitude, depth, place and related USGS events.

## Define the plan

Choose the place, dates and practical constraints you need to check. Use the specific location or activity named on the site, rather than assuming that a nearby place has the same conditions.

## Open the matching records

Start with the available tools and pages below. Keep the record date and source context with any comparison, and separate discovery information from a confirmed booking.

## Check the details before committing

Confirm current opening times, availability, access and terms directly with the named source or operator. Use the question guides for the parts of the plan they actually cover.

## Tools and records

- [Start a search on quakes99.com](https://quakes99.com/)
- [About this site](https://quakes99.com/about)
- [Corrections](https://quakes99.com/corrections)
- [Snapshot events](https://quakes99.com/recent)

## Question guides

- [What is the difference between the Richter scale and the Mercalli scale?](https://quakes99.com/task-guides/richter-scale-vs-mercalli-scale/index.md)
- [How bad is a 6.3 earthquake?](https://quakes99.com/task-guides/how-bad-is-a-6-3-earthquake/index.md)

Source: https://quakes99.com/ (first-party website; inspected 2026-10-18).