Geologic Hazard

Contains geologic hazards in Routt County. Created from source maps per House Bill 1041 in the 1970's Formation Descriptions A: Avalanche -- Boundary of avalanche danger area and flow direction. AL: Active Landslide -- Boundary of a large scale slope failure involving surficial and bedrock material that has not yet stabilized. Maybe composed of poorly sorted thin to thick, fine to course colluvial and bedrock material on gentle to steep slope BR: Bedrock -- All other areas of consolidated earth material usually considered to be sound and stable. BR(US): Bedrock/Unstable Slope -- Bedrock areas that are potentially unstable if distributed; these are poorly consolidated geologic units DF: Debris Fan -- Boundary of cone shaped stream deposited material. Area subject to recurring flooding and deposition. EF: Earth Flow -- Boundary of an area of plastic flowage of a mass of earth material. F: Fault or Fault Zone -- Surface trace of known (documented) plane of rock displacement. Potential for movement exists along these planes during seismic activity. Routt County is in Seismic Zone II. IL: Inactive Landslide – A slope failure bedrock and/or surficial material consisting of one mass movement type that has reached equilibrium and is stabilized under present condition LS: Landslide -- Boundary of a large scale slope failure involving surficial and/or bedrock material. Generally consists of one slope failure type, i.e., a rockslide or a landslide. MF: Mud Flow -- Boundary of a flowing or solidified mass of predominately fine-grained earth material possessing a high degree of fluidity during movement. NONE: No Hazards Mapped. PUS: Potentially Unstable Slopes -- Boundary of slopes with geologic conditions present that may lead to unstability when disturbed. Slope failure may be either surficial or deeper seated. RF: Rockfall -- Boundary of danger zone from falling or rolling rock; landfill and strip mine spoil. RF/PUS: Rockfall/Potentially Unstable Slopes -- RF/US: Rockfall/Unstable Slopes -- S: Subsidence -- Areas of potential ground subsidence. Surface boundaries of underground mining operations; includes filled in gravel pits, landfill and strip mine spoil. SD: Surficial Deposits -- Relatively thin, unconsolidated earth material overlying bedrock. These deposits are not a hazard in themselves, but certain types maybe unstable. SFC: Slope Failure Complex -- Boundary of large areas of failure of surficial and/or bedrock deposits. May consist of different slope failure types, i.e., rockslides, landslides, debris slides, mudflows, and debris avalanches. UNK: Unknown -- Undeterminable from source map or in unmapped area. US: Unstable Slopes -- Boundary of slope areas where slow downward movement is in evidence in the form of slump, soil creep, minor earth flow or heavy erosion. More rapid movement possible. May be man induced or natural. Includes both surficial and deeper seated slope failure. W: High Groundwater Table -- Areas of swamps, sloughs and very near surface groundwater.本数据集涵盖鲁特县（Routt County）的地质灾害要素，其基于20世纪70年代依据《第1041号众议院法案》（House Bill 1041）制作的源地图生成，相关地层描述如下： A: 雪崩（Avalanche）—— 雪崩危险区边界与流动方向。 AL: 活跃滑坡（Active Landslide）—— 涉及表土层与基岩物质且尚未稳定的大型边坡破坏边界。此类破坏由分选较差的薄层至厚层、细粒至粗粒的崩积物与基岩物质组成，分布于缓坡至陡坡区域。 BR: 基岩（Bedrock）—— 所有其他固结岩土区域，通常被认定为稳固且稳定。 BR(US): 基岩/不稳定边坡（Bedrock/Unstable Slope）—— 若分布不均则可能失稳的基岩区域，即固结程度较差的地质单元。 DF: 碎屑扇（Debris Fan）—— 锥形溪流沉积物质的边界区域，易受周期性洪水与沉积作用影响。 EF: 泥流（Earth Flow）—— 土体团块塑性流动区域的边界。 F: 断层或断层带（Fault or Fault Zone）—— 已知（已记录）的岩石位移平面的地表痕迹。地震活动期间，此类平面存在发生位移的风险。鲁特县处于地震区划II区（Seismic Zone II）内。 IL: 非活跃滑坡（Inactive Landslide）—— 已达到平衡状态、在当前条件下趋于稳定的边坡破坏区域，由单一类型块体运动形成的基岩和/或表土层物质组成。 LS: 滑坡（Landslide）—— 涉及表土层和/或基岩物质的大型边坡破坏边界。通常对应单一边坡破坏类型，例如岩崩或滑坡。 MF: 泥流（Mud Flow）—— 以细粒土物质为主、运动时具有高流动性的流动或固结团块区域的边界。 NONE: 未绘制灾害区域。 PUS: 潜在不稳定边坡（Potentially Unstable Slopes）—— 存在地质条件、受扰动后可能失稳的边坡区域。边坡破坏可分为表土层型或深层型。 RF: 落石（Rockfall）—— 坠落或滚动岩石的危险区边界；也涵盖垃圾填埋场与露天矿弃土区。 RF/PUS: 落石/潜在不稳定边坡（Rockfall/Potentially Unstable Slopes） RF/US: 落石/不稳定边坡（Rockfall/Unstable Slopes） S: 地面沉降（Subsidence）—— 潜在地面沉降区域。包括地下采矿作业的地表边界，涵盖回填砾石坑、垃圾填埋场与露天矿弃土区。 SD: 表层沉积物（Surficial Deposits）—— 覆盖于基岩之上的相对薄层松散岩土物质。此类沉积物本身并非灾害，但部分类型可能发生失稳。 SFC: 边坡破坏复合体（Slope Failure Complex）—— 表土层和/或基岩沉积物大范围破坏区域的边界。可包含多种边坡破坏类型，例如岩崩、滑坡、碎屑流、泥流与碎屑雪崩。 UNK: 未知（Unknown）—— 无法通过源地图确定或属于未绘图区域。 US: 不稳定边坡（Unstable Slopes）—— 存在缓慢向下位移迹象的边坡区域，位移形式包括滑坡、土壤蠕动、小型泥流或严重侵蚀。存在发生更快速位移的可能，可由人为活动或自然因素引发，涵盖表土层与深层边坡破坏。 W: 高地下水位（High Groundwater Table）—— 沼泽、泥沼与地下水位极浅的区域。