Nigeria
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Nigeria terletak di Africa dan memiliki klasifikasi risiko seismik Low. Total 0 gempa bumi telah tercatat di negara ini. Dengan populasi 223.800.000 dan luas daratan 923.768 km², peristiwa seismik dapat memiliki implikasi signifikan terhadap infrastruktur dan keselamatan publik.
Tinjauan Seismik
Nigeria presents a more complex seismic picture than most West African countries despite its location on the stable West African craton. The country contains several zones of elevated seismicity associated with ancient basement [[fault]] structures, rift-related features, and the Cameroon Volcanic Line influence along its eastern border. The most seismically active region of Nigeria is the eastern borderland, where the Benue Trough — a Cretaceous failed rift — intersects with the southern extension of the Cameroon Volcanic Line.
The Benue Trough is a broad northeast-trending sedimentary basin that formed as a failed rift arm during the Cretaceous opening of the South Atlantic, approximately 130 million years ago. While the main rift phase has long ceased, the basin-bounding faults and internal fault structures of the trough can be reactivated under the modern stress field, producing occasional moderate earthquakes. A magnitude 5.1 earthquake struck the Jankara area of Plateau State in 2022, causing panic but minimal structural damage. Low-magnitude events are occasionally felt in Jos, Kano, and other northern Nigerian cities.
In southwest Nigeria, the ancient Precambrian basement of the Basement Complex contains numerous northeast and northwest-trending structural lineaments. Some of these, particularly in the Ibadan-Ijebu Ode area, have produced low-level seismicity. Port Harcourt in the Niger Delta sits in a geologically complex zone where delta sediment compaction, subsidence, and possible gas-related processes interact with the regional stress field, occasionally producing minor felt events.
The [[seismic-wave]] characteristics of Nigerian earthquakes reflect the heterogeneous geological substrate — a mix of ancient basement rocks, Cretaceous sedimentary basins, and Cenozoic delta deposits. Wave propagation is efficient in the crystalline basement but attenuated in the thick sedimentary sequences of the Niger Delta. Historical records document a magnitude 6.3 earthquake near Kano in 1969 that was widely felt across northern Nigeria and neighbouring countries. More recently, the increasing use of hydraulic fracturing and water injection in the Niger Delta oil and gas industry has raised questions about the potential for induced seismicity, though confirmed induced events of damaging [[magnitude]] have not been established.
Gempa Terbaru
| Mag. | Lokasi | Waktu | |
|---|---|---|---|
| Tidak ada gempa bumi terbaru. | |||
Earthquakes Near Major Cities in Nigeria
Pertanyaan yang Sering Diajukan
Nigeria has a low level of seismic activity. Large earthquakes are infrequent but not impossible. A total of 0 earthquakes have been recorded in Nigeria's seismic history.
Nigeria 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.
Nigeria is classified in the "Low" 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.
Selama gempa bumi, Merunduk, Berlindung, dan Bertahan. Berlindung di bawah meja atau meja yang kokoh, lindungi kepala dan leher Anda, dan bertahan hingga guncangan berhenti. Jika di luar ruangan, pindah ke area terbuka jauh dari bangunan dan kabel listrik.
Risiko gempa bumi suatu negara dinilai menggunakan beberapa faktor: kedekatan dengan batas lempeng tektonik, seismisitas historis (frekuensi dan magnitudo kejadian masa lalu), kondisi geologi, kepadatan penduduk di zona seismik, dan penegakan standar bangunan. QuakeFYI menetapkan zona seismik dari 0 (tanpa risiko) hingga 4 (sangat tinggi) berdasarkan faktor-faktor tersebut.
Zona seismik adalah wilayah geografis yang diklasifikasikan berdasarkan tingkat bahaya gempa bumi. Zona 0 memiliki risiko yang dapat diabaikan, Zona 1 memiliki risiko rendah, Zona 2 memiliki risiko sedang, Zona 3 memiliki risiko tinggi, dan Zona 4 memiliki risiko sangat tinggi. Zona-zona ini ditentukan oleh data gempa bumi historis, kondisi tektonik, dan kondisi geologi.
Negara-negara di sepanjang Cincin Api Pasifik mengalami gempa bumi paling banyak. Jepang, Indonesia, Chili, Filipina, dan Iran secara konsisten mencatat aktivitas seismik tertinggi. Amerika Serikat (terutama Alaska dan California), Turki, dan Meksiko juga termasuk negara-negara dengan aktivitas seismik tertinggi.
Kepadatan penduduk memperbesar risiko gempa bumi karena lebih banyak orang dan infrastruktur yang terpapar potensi kerusakan. Gempa bumi magnitudo 7,0 di kota yang padat penduduknya dapat menyebabkan ribuan korban, sementara kejadian yang sama di area tak berpenghuni mungkin tidak menyebabkan korban. Standar bangunan dan kesiapsiagaan darurat sangat mengurangi risiko di area padat penduduk.
Kepadatan seismik mengukur konsentrasi aktivitas gempa bumi relatif terhadap luas daratan suatu negara, dinyatakan sebagai gempa bumi per 1.000 kilometer persegi. Kepadatan seismik yang tinggi menunjukkan aktivitas gempa bumi yang sering per satuan luas, membantu membandingkan risiko seismik antara negara-negara dengan ukuran berbeda.