Geohazards 0.0 / 5 ? GeographygeohazardsUniversityNone Created by: tom stathamCreated on: 23-05-14 11:23 What does the Mercalli scale measure? intensity 1 of 19 How is ground motion measured G force 2 of 19 What is the speed of P waves 8 km/s 3 of 19 What is the core temperature of Earth? 5000 degrees celcius 4 of 19 shallow focuses produce 75% of earthquakes but how deep are they? 0-70km 5 of 19 tsunami waves can travel up to 800 km/hr 6 of 19 Eruptive style one consists of effusive, low silica, divergent and hotspots 7 of 19 What is phreatomagmatic? when surface water and magma interact; explosive and pulsed 8 of 19 What does infrared measure? Heat energy 9 of 19 What does doppler radar measure? veolcity 10 of 19 What does UV absorption measure? gas flux 11 of 19 What range is infrared in Hz measured? 0-20 12 of 19 VT volcanoes are measured by... ? Measured weeks to months in advance 13 of 19 Bombs are >64mm 14 of 19 Ash is >4mm 15 of 19 Water pressure and the downslope component of weight are examples of shearing processes 16 of 19 examples of shear stress include; Cohesion Frictional resistance 17 of 19 What is a Sturzstrom? catastrophic debris stream triggered by rock avalanches 18 of 19 Landslides are common in destabilised areas; deforestation, illegal fires, terracing and abandoned road construction Dangerous; High velocity - 10 m/s Large volume - 100-10 m m3 material 19 of 19
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