Contact | RSS | EN | DE | EL | ES | FR | IT | RU

Current Global Seismic Activity Level (GSAL)

Updated: Nov 19, 2023 17:38 GMT -
In order to find out whether worldwide earthquake activity has been increasing or decreasing or at which level it is now compared to the past, check out our Global Seismic Activity Level charts below. Feel free to embed the graphics on your own website if you like!
For detailed stats on the level of activity now compared to earlier, check the Quake-O-Meter!

How this value is calculated and what it means

The Global Seismic Activity Level (GSAL) was developed by geologist and volcanologist Tom Pfeiffer PhD for VolcanoDiscovery, as an online tool to visualize current levels of seismic activity on a global scale. It is based on the averages of all earthquakes during a given time interval.
GSAL is a numeric value ranging from 0-10 indicating the current level, from low to extreme, of seismic activity worldwide. It is calculated by combining the energy of all known earthquakes worldwide during a given time interval (default being the past 24 hours). It corresponds to the theoretical magnitude of all earthquakes during the specified time interval occurring together in single event. This value represents a moving average which changes constantly as new earthquakes occur. It allows to monitor the appearance of clusters of larger quakes around the world, and typically fluctuates around moderate ("green") levels around values of 6.0.
For instance: if the level for one day is at 6.3, it means that if all earthquakes in the world occurred together as one, it would be at around magnitude 6.3.

Further considerations:
GSAL furthermore takes into account:
- It is assumed that all quakes above magnitude 5 are being recorded; these quakes are weighted by a factor of 1.
- It is also assumed that a significant number of smaller magnitude quakes go unnoticed as global coverage by seismic networks is not able to detect all quakes below magnitude 5. Based on statistical information from areas with very good coverage of even small quakes (such as in California, Italy etc), a small correction for the true number of small quakes beneath magnitude 5 is applied. This weight factor for smaller quakes ranges from 1.3 for quakes within magnitudes 4.5-4.9 to 5 times for quakes between magnitude 2.0-2.9.
However, as the larger quakes contribute so much much more to the global energy release than all smaller combined, the effect of this correction, i.e. assuming more of the smaller quakes than recorded, is actually quite small.

Try our free app!
Volcanoes & Earthquakes - new app for Android
Android | iOS version

Support us - Help us upgrade our services!

We truly love working to bring you the latest volcano and earthquake data from around the world. Maintaining our website and our free apps does require, however, considerable time and resources.
We need financing to increase hard- and software capacity as well as support our editor team. We're aiming to achieve uninterrupted service wherever an earthquake or volcano eruption unfolds, and your donations can make it happen! Every donation will be highly appreciated. If you find the information useful and would like to support our team in integrating further features, write great content, and in upgrading our soft- and hardware, please make a donation (PayPal or Online credit card payment).

Planned features:
  • Improved multilanguage support
  • Tsunami alerts
  • Faster responsiveness
Thanks to your past donations, these features have been added recently:
  • Design upgrade
  • Detailed quake stats
  • Additional seismic data sources
Download and Upgrade the Volcanoes & Earthquakes app to get one of the fastest seismic and volcano alerts online:
Android | IOS
Thank you!
Stop Russia's Agression - Support Ukraine
Significant parts of this website use brilliant open-source software developed by Ukrainians. Russia's unprovoked war has killed tens of thousands, displaced millions, and the beautiful country of Ukraine is being destroyed. We cannot be silent even if the topic of this website has nothing to do with politics.
If you like to support Ukraine from abroad:
Ukrainians recommend the Come Back Alive charity. For other options, see StandWithUkraine.
Sources: VolcanoDiscovery / VolcanoAdventures and other sources as noted.
Use of material: Most text and images on our websites are owned by us. Re-use is generally not permitted without authorization. Contact us for licensing rights.
Volcanoes & Earthquakes
VolcanoDiscovery Home
Volcanoes | Earthquakes | Photos | Volcano News | App
Adventure & Study Travel
Tours to Volcanoes and Volcanic Areas: walking tours, photo tours, study tours
Tours & Dates | FAQ | About us
Get our newsletter!
Company info
Contact | Legal info | Terms & conditions
Follow us
Follow us on facebook Follow us on Instagram Follow us on Twitter Visit our Youtube channel
EN | DE | EL | ES | FR | IT | RU
VolcanoDiscovery GmbH, Germany, Reg. nr.: HRB 103744, EU Tax Id: DE 297 465 123 owned and created by
Dr. Tom Pfeiffer, volcanologist, volcano photographer, tour organizer member of
Volcanological Society
Ecotourism Greece
Insured by R+V
VolcanoDiscovery © 2004- All Rights Reserved | Privacy - cookie settings