M7.7 SEISMIC EVENT

Eastern Indonesia Earthquake & Aftershock Simulator

BNPB Source Grounded • Banda & Molucca Arcs

BNPB Disaster Agency Situation: Magnitude 7.7 undersea rupture in eastern Indonesian waters (Banda/Molucca subduction zone). At least 47 casualties reported; coastal island communities experiencing intense shaking and cascade aftershocks.

Seismic Presets Scenarios

Rupture & Fault Mechanics Physics

Mainshock Magnitude ($M_w$) 7.7

Hypocenter Focal Depth ($h$) 24 km

Omori Decay Exponent ($p$) 1.10

Gutenberg-Richter $b$-value 1.02

Wavefield Overlays Visuals

Compressional P-Wave Front ($v_p \approx 7.2 \text{ km/s}$) Shear S-Wave Front ($v_s \approx 4.1 \text{ km/s}$) Modified Mercalli (MMI) Contours Bathymetric Tsunami Wavefront ($v=\sqrt{gd}$)

T + 00h : 00m : 00s (Mainshock Rupture)

0h 72h

Real-time Telemetry Dynamic

Elapsed Time

0.00 h

Aftershocks ($M \ge 3.5$)

Max PGA (g)

0.68 g

Aftershock Rate $n(t)$

-- / hr

Regional Island Impact (MMI) ShakeMap

Location	Dist (km)	MMI Level	Status

Omori-Utsu Decay Model Formula

Aftershock frequency follows $n(t) = \frac{K}{(t + c)^p}$. Decay exponent $p$ controls how rapidly the tectonic stress field equilibrates.

Cumulative $N(t \le 72\text{h}) \approx$ 84 events ($M \ge 3.5$)

Modified Mercalli Scale Intensity

IV (Light) VII (Very Strong) IX+ (Violent/Destructive)

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