deposits of clay, silt, sand, gravel, or other particulate material that has been deposited by a stream or other body of running water in a streambed, on a flood plain, on a delta, or at the base of a mountain
A general term for clay, silt, sand, gravel, or similar unconsolidated detrital material, deposited during comparatively recent geologic time by a stream or other body of running water, as a sorted or semisorted sediment in the bed of the stream or on its floodplain or delta, as a cone or fan at the base of a mountain slope; esp such a deposit of fine-grained texture (silt or silty clay) deposited during time of flood
Deposits of clay, silt, sand, gravel or other particulate rock material left by a river in a streambed, on a flood plain, delta, or at the base of a mountain
A general term for geologic materials deposited by running water (e g , streams, rivers) The term applies to deposits of recent time that have not been consolidated and cemented into rock
Sand, gravel, silt, and clay deposited adjacent to modern streams and derived from erosion of surface sediments elsewhere in the watershed or from valley walls
A general term for detrital deposits made by stream processes on riverbeds, floodplains, and alluvial fans; esp a deposit of silt or silty clay laid down during times of flood The term applies to stream deposits of recent time It does not include subaqueous sediments of seas or lakes
Loosely compacted gravel, sand, silt, or clay deposited by streams Amplification An increase in seismic-signal amplitude within some range of frequency as waves propagate through different earth materials The signal is both amplified and deamplified at the same site in a manner that is dependent on the frequency band The degree of amplification is also a complex function of the level of shaking such that, as the level of shaking increases, the amount of amplification may decrease Shaking levels at a site may also be increased by focusing of seismic energy caused by the geometry of the sediment velocity structure, such as basin subsurface topography, or by surface topography Amplitude Zero-to-peak value of any wavelike disturbance Arc Commonly refers to the chain of volcanoes (volcanic arc) that sometimes form inland and that are produced by subduction
Deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas