Flores Arc Seismic Wave Propagation & Attenuation Workbench

2D Crustal Cross-Section & Seismic Ray Tracing (0-100 km Depth)

Direct P-Wave Direct S-Wave Moho Boundary (30km)

Drag Hypocenter Focus (★) or Receiver (▲)

Hypocentral Dist (Rhyp) 47.43 km Epicentral: 45.0 km

          Peak Accel (PGA)
          0.482 g
          PGV: 44.8 cm/s
        

Estimated MMI VIII (Severe) Radius VII: 88.5 km

Wave Arrivals (tP / tS) P: 8.12s | S: 14.15s S-P Lag: 6.03s

Earthquake Magnitude (Mw) 7.7 Mw

Hypocenter Depth (Zhyp) 15.0 km

Receiver Epicentral Distance (Repi) 45.0 km

Site Soil Condition (Vs30) 360 m/s

Geophysics Mechanism: The M7.7 Flores event occurred at shallow 15 km depth along the Flores Back-Arc Thrust. Because seismic energy radiated through thin island-arc crust with minimal geometric spreading before reaching the surface, coastal towns experienced severe near-fault ground motion (MMI VIII+).

GMPE Ground Motion Attenuation (PGA vs Distance) Joyner-Boore & BSSA14 Model

Synthetic Tri-Axial Station Seismogram (Z / N / E) P-wave: 8.1s | S-wave: 14.2s

Crustal P-Wave Velocity (Vp): 5.80 km/s Mantle P-Wave Velocity (Vp): 8.00 km/s

Crustal S-Wave Velocity (Vs): 3.35 km/s Mantle S-Wave Velocity (Vs): 4.60 km/s

Rupture Seismic Energy (E0): 1.12e+16 Joules Moho Refraction Critical Angle: 46.4°