Recurrence interval

Many independent researchers worked to develop reliable methods for estimating recurrence intervals for earthquakes (e.g.,... 

Bloom, E.D., 1981, A Technique to Reliability Estimate Earthquake Recurrence Intervals, EPRI... 

The rainfall frequency data for each recurrence interval fits an empirical equation in the form of... 

Fig. 17 Weighted frequency of the various process types [64]. Only flood events with a recurrence interval of more than 10 years are considered. These events are weighted as follows A process type which results in an event with a recurrence more than 30 years is accorded the weighting 3. A recurrence of more than 20 but less than 30 years corresponds to a weighting of 2, and a recurrence of more than 10 but less 20 years corresponds to a weighting of 1. The weightings are then aggregated for each process type per catchment...

The term 10-year, 24-hour rainfall event refers to a rainfall event with a probable recurrence interval of once in 10 years as defined by the National Weather Service. 

Fig. 8. Recurrence intervals for water level residuals calculated from a 38-yr water level record at NL.

Alluvial fans cut by tectonic faults can also yield information on the frequency of earthquakes. An offset debris flow fan in Owens Valley (California) was dated with °Be by Bierman et al. (1995). Based on boulder ages from different parts of the flow and the record of three faulting events, the authors deduced earthquake recurrence intervals of 5800-8000 years for that location. Zreda and Noller (1998) measured C1 in a bedrock fault scarp at Hebgen Lake (Montana) and were able to extract the ages of six prehistoric... 

The basic wind speed on the map. Figure 3-1, corresponds to a 3-sec. gust speed at 33 ft above the ground, in Exposure Category C with an annual probability of 0.02 (50-year mean recurrence interval). 

Precipitation types, quantities, duration, frequency, and recurrence interval... 

Statistical methods are used to predict river flow and assume that recurrence intervals of extreme events bear a consistent relationship to their magnitudes. A recurrence interval,... 

Baker (1979) estimated that the active life span of most volcanoes probably is between one and two million years. Since the activity frequently follows a broadly cyclical pattern, some benefit in terms of hazard assessment may accrue from the determination of the recurrence interval of particular types of eruption, the distribution of the resulting deposits, the magnitude of events and the recognition of any short-term patterns of activity. For instance, according to Booth (1979), four categories of hazard have been distinguished in Italy ... 

Very high frequency events with mean recurrence interval, (MRI), of less than two years. The area affected by such events is usually less than 1 km. ... 

Analyses of discharge are related to the recurrence interval to produce a flood frequency curve (Fig. 8.10). The recurrence interval is the period of years within which a flood of a given... 

Due to the warm climate at the SRS, large accumulatioits of snow and ice (which could potentially collapse the roo ) are rare. Table 2.3>2 of Reference 8-28 lists the recurrence intervals of ice accumulations at SRS. From this tabl the amount of ice present at a recurrence... 

As an integral part of transportation systems, bridges are designed to move people, goods, and services efficiently, economically, and safely. Landslides can disrupt or damage these systems at a variety of spatial and temporal scales, dramatically reducing network serviceability, increase costs, and decrease safety. Recurrence intervals for landslide events span from daily to centuries, whereas the associated consequences range from inconvenient to catastrophic. 

At the Ulchin NPP Units 3 and 4, maximum wind speed as recurrence interval of 100 years is adequately determined using site specific data for the design of seismic Category I structures. 

Until recently tall buildings were designed solely on the basis of the requirement that their structural system and their parts and portions must withstand the design wind loads specified in the applicable building code. Code loads are specified without explicit consideration of wind directionality. For most structures, design wind loads specified in codes and standards have a 50-year nominal mean recurrence interval. 

Away from plate boundaries, loading (stressing) rates are low and intraplate earthquakes consequently should occur less frequently than plate boundaries events - their recurrence intervals should be longer. 

Nishenko and Buland (1987) found that normalized earthquake recurrence intervals, for large earthquakes in the circum-Pacific region, along... 

Nishenko SP, Buland R (1987) A generic recurrence interval distribution for earthquake forecasting. Bull Seismol Soc Am 77 1382-1399... 

Seismic Parameters Occasional (recurrence interval 72 years or 50 % in 50 years) Rare (recurrence interval 475 years or 10 % in 50 years)... 

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