Guinea-Bissau
Guinea-Bissau is located in Africa and has a Minimal seismic risk classification. A total of 0 earthquakes have been recorded in the country's seismic history. With a population of 1,781,308 and a land area of 36,125 km², seismic events can have significant implications for infrastructure and public safety.
Seismic Overview
Guinea-Bissau is a small coastal nation in West Africa bordered by Senegal to the north and Guinea to the south. The country lies entirely on the West African craton and its Atlantic passive margin — among the most geologically stable settings imaginable. The Bijagós Archipelago, which forms a large offshore portion of the country, sits on the continental shelf in waters of modest depth above the ancient passive margin sedimentary sequences.
The country is remote from any active plate boundary. The nearest active tectonic feature of consequence is the Mid-Atlantic Ridge, which lies thousands of kilometres to the west. The passive margin that forms the country's offshore zone has been tectonically inactive since the Cretaceous, more than 65 million years ago. Ancient transform fault zones from the South Atlantic opening intersect the continental margin at roughly Guinea-Bissau's latitude but are entirely dormant.
Historical seismic records for Guinea-Bissau document no earthquake of any significance. The [[seismic-wave]] detection capability in the region is limited by sparse instrumental networks, but the very low level of natural seismicity means that even moderate events have not occurred within the country's borders in the modern era. [[magnitude]] events above 4.0 are not recorded within Guinea-Bissau in the global earthquake catalogues.
Guinea-Bissau's building stock — largely informal and low-rise — is not designed to seismic specifications, but this is irrelevant given the essentially non-existent earthquake hazard. The country's risk profile is dominated by flooding, coastal erosion, and disease rather than geological hazards. Guinea-Bissau represents one of the lowest-seismicity territories in Africa.
Recent Earthquakes
| Mag | Location | Time | |
|---|---|---|---|
| No recent earthquakes. | |||
Earthquakes Near Major Cities in Guinea-Bissau
Frequently Asked Questions
Guinea-Bissau has a minimal level of seismic activity. Large earthquakes are infrequent but not impossible. A total of 0 earthquakes have been recorded in Guinea-Bissau's seismic history.
Guinea-Bissau has had 0 recorded earthquakes. This count includes events of all magnitudes detected by seismic monitoring networks. The actual number of earthquakes may be higher, as smaller events can go undetected.
Guinea-Bissau is classified in the "Minimal" seismic zone, located in Africa. Seismic zones indicate the relative level of earthquake hazard based on historical activity, geological conditions, and proximity to tectonic plate boundaries.
During an earthquake, Drop, Cover, and Hold On. Get under a sturdy desk or table, protect your head and neck, and hold on until shaking stops. Move away from windows and heavy objects. After the earthquake, check for injuries and be prepared for aftershocks.
Country earthquake risk is assessed using several factors: proximity to tectonic plate boundaries, historical seismicity (frequency and magnitude of past events), geological conditions, population density in seismic zones, and building code enforcement. QuakeFYI assigns seismic zones from 0 (no risk) to 4 (very high) based on these factors.
A seismic zone is a geographic area classified by the level of earthquake hazard. Zone 0 has negligible risk, Zone 1 has low risk, Zone 2 has moderate risk, Zone 3 has high risk, and Zone 4 has very high risk. These zones are determined by historical earthquake data, tectonic setting, and geological conditions.
Countries along the Pacific Ring of Fire experience the most earthquakes. Japan, Indonesia, Chile, the Philippines, and Iran consistently record the highest seismic activity. The United States (especially Alaska and California), Turkey, and Mexico are also among the most seismically active nations.
Population density amplifies earthquake risk because more people and infrastructure are exposed to potential damage. A magnitude 7.0 earthquake in a densely populated city can cause thousands of casualties, while the same event in an uninhabited area may cause none. Building codes and emergency preparedness greatly reduce risk in populated areas.
Seismic density measures the concentration of earthquake activity relative to a country's land area, expressed as earthquakes per 1,000 square kilometers. A high seismic density indicates frequent earthquake activity per unit area, helping compare seismic risk between countries of different sizes.