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The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
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Murphy Scale: A locational equivalent intensity scale for hazard events.

Yi Victor Wang1, Antonia Sebastian2

  • 1Institute for Earth, Computing, Human and Observing (ECHO), Chapman University, Orange, California, USA.

Risk Analysis : an Official Publication of the Society for Risk Analysis
|May 16, 2022
PubMed
Summary

A new Murphy Scale offers a common metric for comparing disaster strengths across different hazards. This enables better multi-hazard risk assessment and preparedness planning.

Keywords:
global disaster researchhazard equivalencyhazard intensityhazard strengthmulti-hazard

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Area of Science:

  • Disaster Risk Science
  • Geoscience
  • Environmental Science

Background:

  • Assessing disaster vulnerability, resilience, and risk across different hazard types necessitates a unified metric for hazard intensity.
  • Existing metrics are often hazard-specific, limiting cross-hazard comparisons and integrated risk analysis.

Purpose of the Study:

  • To introduce the Murphy Scale, an equivalent intensity scale for cross-hazard evaluation of event strengths.
  • To establish a methodology for deriving equivalent hazard intensities applicable to diverse event types.

Main Methods:

  • A systematic review and typology of existing hazard strength metrics were conducted.
  • An empirical methodology was developed to calculate equivalent intensities on the proposed Murphy Scale.
  • Historical data (2013-2017) for earthquakes and tropical cyclones were used for validation.

Main Results:

  • The study demonstrates the utility of the Murphy Scale methodology for computing equivalent intensities for earthquakes and tropical cyclones.
  • The proposed scale provides a foundational tool for the emerging field of hazard equivalency.
  • Equivalent intensities were empirically derived for selected historical events.

Conclusions:

  • The Murphy Scale facilitates the creation of multi-hazard maps by enabling standardized hazard strength evaluation.
  • This scale enhances hazard communication, improving multi-hazard preparedness, mitigation, and emergency response strategies.
  • The research lays the groundwork for integrated multi-hazard risk assessment and management.