Table 1 Input parameters for simulated volcanic hazards
From: A scenario-based volcanic hazard assessment for the Mount Meager Volcanic Complex, British Columbia
Code | Parameters | Scenario 1 | Scenario 2 | Scenario 3 |
|---|---|---|---|---|
Pyroclastic Density Currents | ||||
 Energy cone model, implemented within LAHARZ | ∆H/L | 0.4 | 0.3 | 0.2 |
Simulated volume | 1 × 105 m3 | 1 × 106 m3 | 1 × 107 m3 | |
Lahars | ||||
 LAHARZ | Reference eruption | Cotopaxi 2015 (Global Volcanism Program 2016) | Nevado del Ruiz 1985 (Pierson et al. 1990) | Mt. St. Helens 1980 (Wolfe and Pierson 1995) |
Reference volume | 50, 000 m3 | 1.6 × 107 m3 | 1 × 108 m3 | |
Simulated volumes | 1 × 106 m3 | 1 × 107 m3 | 1 × 108 m3 | |
H/L | 0.3 | 0.3 | 0.3 | |
DEM resolution | 20 m | 20 m | 20 m | |
 VolcFlow | Coefficient of turbulence | N/A | 0.01 | 0.01 |
Viscosity | 0.01 Pa.s | 0.01 Pa.s | ||
Density | 1600 kg/m3 | 1600 kg/m3 | ||
Cohesion | 500 Pa | 500 Pa | ||
Internal and basal angles of friction | 0° | 0° | ||
Discharge rate | 47,000 m3/s | 47,000 m3/s | ||
Maximum reference flow duration | 3 h | 4 h | ||
DEM resolution | 20–40 m | 20–100 m | ||
Tephra fall | ||||
 TephraProb | VEI | 3 | 3–4 | > 5 |
Grid resolution (m) | 1000 | 2500 | 2500 | |
Plume height (km asl) | 10–15 | 15–20 | 20–40 | |
Erupted Mass (kg) | 1 × 108 – 1 × 1011 | 1 × 109–1 × 1012 | 5 × 1011–5 × 1013 | |
TGSD range (Ф) | -6 – 8 | -5 – 9 | -4 – 10 | |
Median diameter (Ф) | -3 – 0 | −1 – 2 | 0–4 | |
Sorting (Ф) | 1–2 | 2.5 | 3–4 | |
Aggregation coefficient | 0.3–0.7 | 0.3–0.7 | 0.3–0.7 | |
Lithic density (km/m3) | 2600 | 2400 | 2200 | |
Pumice density (kg/m3) | 1000 | 700 | 500 | |
Diffusion coefficient (m/s2) | 10 | 500 | 2500 | |
Fall-time threshold (s) | 50 | 500 | 6000 | |
Eruption duration (hours) | 2–4 | 4–10 | 12–120 | |