Real-time coverage of earthquake event — 218 km W of Bandon, Oregon — Pandita Data.
🌍 OPEN LIVE 3D EARTHQUAKE MAPA 5.5-magnitude earthquake struck 218 km west of Bandon, Oregon at 11:35 UTC on June 29, 2026, at 10 km depth. The USGS assigned a GREEN PAGER alert, indicating minimal damage and injury risk. No tsunami warning was issued. Seventeen people reported feeling the tremor across coastal Oregon and northern California.
This moderate offshore earthquake occurred within the Blanco Fracture Zone, a major strike-slip fault system that accommodates relative motion between the Juan de Fuca and Pacific plates. The location—well west of the continental margin—places it outside the primary Cascadia subduction zone but within an active transform fault network that regularly produces magnitude 5–6 events. The shallow 10 km depth amplified seismic wave propagation to nearby coastal communities, explaining reports from observers up to 300 km away, despite the remote epicenter.
The Blanco Fracture Zone is a right-lateral strike-slip fault that runs northeast–southwest off the Oregon coast. Unlike subduction zones that generate great earthquakes (magnitude 8+), strike-slip faults typically produce moderate events as plates slide horizontally past each other. The Juan de Fuca plate moves northwest at roughly 4.6 cm/year relative to the Pacific plate, accumulating stress that releases episodically. This region generates 15–20 earthquakes of magnitude 5.0+ per decade—a normal background seismic rate for an active transform boundary.
The 5.5 magnitude represents energy release of approximately 5.6 × 10¹⁴ joules—equivalent to 134 kilotons of TNT. The shallow 10 km hypocenter meant seismic waves traveled efficiently through crustal rock to the surface, maximizing felt intensity at moderate distances. For a strike-slip mechanism, the rupture likely propagated laterally along the fault plane, with maximum slip concentrated near the nucleation point.
Shallow earthquakes radiate energy more efficiently to the surface than deep events. Ground acceleration at 100 km distance can exceed 0.05g—enough to rattle dishes and alarm observers, but rarely sufficient to cause structural failure in modern buildings. The offshore location further reduced onshore impact; had this rupture occurred beneath populated areas, damage would be significant.
Coastal Oregon communities from Bandon to Port Orford and inland to Grants Pass experienced light shaking (Modified Mercalli Intensity III–IV). No structural damage was reported. The offshore epicenter placed the rupture 218 km from populated areas, effectively decoupling the earthquake from significant infrastructure risk. Historical records show similar Blanco Fracture Zone events in 2005 (M 5.9) and 2016 (M 5.2)—all producing minimal impacts despite moderate magnitudes.
Tsunami risk: The USGS issued no tsunami warning. Strike-slip faults rarely displace water columns vertically; horizontal motion generates minimal wave energy. Deep subduction zone ruptures—like those on the Cascadia megathrust—pose genuine tsunami hazards. This event did not.
Pandita Data's real-time earthquake simulation platform visualizes fault rupture propagation and seismic wave radiation patterns, helping communities understand how offshore events interact with coastal geometry. Access live USGS seismometer feeds and 3D fault models at panditadata.com to explore the Blanco Fracture Zone's ongoing tectonic activity.