Western Colombia Seismic Wave & Structural Damage Field Lab

Physical Wavefield & Multi-Story Masonry Oscillator

P-Wave (6.0 km/s)

S-Wave (3.4 km/s)

Rayleigh Wave (3.0 km/s)

Sim Elapsed: 0.00 s

P-Wave Arrival

19.2 s

Hypocenter 120.2 km

S-Wave Arrival

33.8 s

S-P Lag: 14.6 s

Site Amplification

1.75x

Volcanic Ash & Alluvium

Estimated Peak PGA

0.38 g

Observed MMI: VII (Strong)

Resonant Period (T₀)

0.28 s

2-Story Masonry Frame

Inter-Story Drift

0.00 %

Shear: 0 kPa

European Macroseismic Scale (EMS-98) & Collapse Risk Grade 4: Very Heavy Damage

Simulated ground acceleration exceeds unreinforced masonry tensile limits. High shear cracking along diagonal load-bearing brickwork, partial roof separation, and significant life-safety hazard without reinforced confining elements.

Event Presets

Seismic Source Parameters

Moment Magnitude (Mw) 7.4

Epicentral Distance (km) 115 km

Focal Depth (km) 35 km

Pereira Soil Stratigraphy

Seismic Retrofitting Workbench

Apply seismic mitigation interventions to improve ductile shear resistance of the masonry dwelling:

RC Tie-Columns (Confined Masonry) +35% Shear Upper Reinforced Ring Beam +25% Box Action Ferrocement Plaster Mesh Jacket +45% Ductility

Estimated Collapse Probability

78.4 %

Unreinforced baseline structure

Trace the saved geometry and simulation branch formulas

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Read the explanation

The damage laboratory calculates hypocentral distance as the square root of epicentral distance squared plus depth squared. For illustrative horizontal distance sixty kilometers and depth eighty kilometers, the path is one hundred kilometers. P arrival is path divided by six point two five, rounded to one decimal: sixteen seconds. S arrival divides by three point five five and rounds to twenty-eight point two. Both bars show seconds on a common twenty-pixel scale. The source event date and city reference remain unverified authored fixtures. The site branch assigns amplification one point seven five for alluvial ash and one for bedrock. These bars compare the actual assigned factors on one three-hundred-pixel scale. The source exponentiates minus point five plus point five two times magnitude, minus point nine five times natural logarithm of path distance, minus point zero zero three times path. It multiplies by the site factor and rounds to two decimals. These written coefficients and intensity labels do not establish a calibrated hazard model. The structural capacity multiplier starts at one. Its tie-column checkbox adds point three five; its ring-beam checkbox adds point two five. With both enabled the multiplier is one point six before any mesh contribution. Both bars show this authored multiplier on a common four-hundred-pixel scale. Subsequent grade and collapse fields are conditional model outputs, not measured collapse probabilities or retrofit certification. The full original report and checkbox state remain available; the video describes the source algebra without asserting engineering safety.