Magnitude and intensity: why one earthquake feels different from place to place
Magnitude describes the size of an earthquake at its source. Intensity describes its effects at a particular location. Here is how to read both correctly.
Read the storyField notes from a living planet
Understand earthquakes, volcanoes and the data behind them. Clear explanations, practical guides and links to original sources.
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Epicentre, depth and distance: seeing an earthquake in three dimensions
A map marker tells only part of the story. The focus is underground, the rupture covers an area, and distance from the epicentre alone cannot establish safety.
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Reading an earthquake map: times, filters and where the data comes from
An earthquake map presents selected source records. Learn what the 24-hour window, revisions, filters and missing events mean before drawing conclusions.
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USGS volcano alert levels: understanding the words and colours
A USGS ground alert level and an aviation colour code answer different questions. One coloured symbol cannot replace the notice or a local hazard map.
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Prediction, forecasting and early warning: three different tasks
Early warning detects an earthquake that has already started. A forecast estimates probabilities. Reliable precise prediction of a particular earthquake is not available.
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Earthquake preparedness: a practical plan for your home and family
Start with actions you can take today: secure furniture, choose cover, agree on contacts and practice the plan together.
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How to read a tsunami bulletin and find local instructions
Look beyond the headline: check the issuing center, publication time, named stretch of coast and instructions from local authorities.
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Using an earthquake app offline: what stays available without a connection
Built-in learning material can support preparation without a connection. Cached earthquake records remain an earlier snapshot, even when they look familiar.
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A family emergency kit you can assemble and maintain
A useful kit fits the people who need it, stays accessible and gets checked regularly. Start with water, personal needs and your family plan.
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How to learn Earth science: from planetary layers to earthquakes
Start with one question, test an explanation with a model and identify what the model simplifies. Connect scientific terms to observations.
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