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