Periods are between 0.5 and 0.8 sec. | |||||||||||
0.26 to 0.50 | |||||||||||
Schists, metamorphic clastic, igneous cracked | 0.36 | Between 3 and 10% | Between 10 - 8 | Between 10% - 40% | 0.15 to 0.25 | Between 20,000 and 10,000 | Between 30 and 50 | Between 80 and 50 | |||
Compact breccias and conglomerates, sandstones cohesive | 0.48 | And 10 - 5 | |||||||||
Soft clay deposits or sands averages and thicknesses of 10 m or more with or without the presence of intermediate layers of sand or other non- cohesive soils class (this material can be characterized by a propagation velocity of shear wave of less than 240 m/sec.) | Unconsolidated rock or soil, weatherproof í sm significant sedimentary rocks, intrusive and volcanic water table fluctuations. | Average | Volcano sedimentary rocks | 0.54 | |||||||
Periods are between 0.8 and 1.2 sec. | From 0.51 to 0.75 | ||||||||||
Clays compact | 0.62 | Between 10% and 30% | Between 10 - 2 | Between 40% - 70% | Between 0.25 and 0.50 | Between 10,000 and 5000 | Between 50 and | Between 50 and 20 | |||
With jointing massive argillaceous rocks, conglomerates with medium cohesion diaclasades | 0.72 | And 10 - 5 | 70 | ||||||||
Soft clay deposits with a thickness of 12 m (this material can be characterized by a propagation velocity of shear wave of less than 150 m/sec.) | Quaternary unconsolidated soils, fill clay soils and pyroclastic unconsolidated fluvio-lacustrine, shallow groundwater levels. | High | Loams, silts, sandstones | 0.76 | |||||||
0.76 to 1 | Sandy clay soils, | 0.88 | Over 30% | Greater than 10 - 2 | Greater than 70% | Greater than 0.50 | Less than 5.000 | Greater than 70 | Less than 20 | ||
Swamp deposits, fluvio-lacustrine, alluvial | 0.96 |