Hazard Curve Data

Discover hazard models that provide hazard curves

A hazard curve gives the probability of exceeding each intensity measure level at a site. Hazard curves are available through the EFEHR REST API under the base URL https://efehr-services.ethz.ch/hazard/api/v1. All endpoints use HTTP GET and return JSON by default; add format=nrml to receive NRML instead. Data are published under CC BY 4.0 (DOI 10.12686/a15).

The steps below narrow down the options available at your site (model, intensity measure type, soil type, aggregation) and then retrieve the curve. The examples use Basel (47.5° N, 7.6° E) and the European Seismic Hazard Model 2020 (ESHM20, model id 81). Long lists in the response examples are shortened with "…". The complete, interactive reference is available at efehr-services.ethz.ch/hazard/api/docs.

Which hazard models provide hazard curves?

User query Which hazard models provide hazard curves for the site of my interest?
Request format /v1/models?lat=[latitude]&lon=[longitude]&filter_curves=true
Parameters
  • lat (required): latitude, −90 to 90
  • lon (required): longitude, −180 to 180
  • filter_curves (optional): true to list only models with hazard curves
  • format (optional): json (default) or nrml
Request example https://efehr-services.ethz.ch/hazard/api/v1/models?lat=47.5&lon=7.6&filter_curves=true
Response example 
{
  "models": [
    {
      "id": 77,
      "name": "Swiss Hazard Model 2015 (SUIhaz15)"
    },
    {
      "id": 81,
      "name": "European Seismic hazard Model 2020 (ESHM20)"
    }
  ],
  "count": 2
}

Which intensity measure types are covered by a model?

User query For which intensity measure types are hazard curves available from the model of my interest, at the site of my interest?
Request format /v1/curves/imts?lat=[latitude]&lon=[longitude]&modelid=[modelid]
Parameters
  • lat (required): latitude, −90 to 90
  • lon (required): longitude, −180 to 180
  • modelid (required): model identifier, from the model list
Request example https://efehr-services.ethz.ch/hazard/api/v1/curves/imts?lat=47.5&lon=7.6&modelid=81
Response example 
{
  "imts": [
    {
      "code": "PGA",
      "name": "PGA",
      "unit_type": "g",
      "unit_description": "gravity, 1g = 980.5 cm/s/s defined for the B/C boundary Vs30=760m/s"
    },
    {
      "code": "SA[0.05s]",
      "name": "SA[0.05s]",
      "unit_type": "g",
      "unit_description": "gravity, 1g = 980.5 cm/s/s"
    },
    {
      "code": "SA[0.10s]",
      "name": "SA[0.10s]",
      "unit_type": "g",
      "unit_description": "gravity, 1g = 980.5 cm/s/s"
    },
    "\u2026",
    {
      "code": "SA[5.00s]",
      "name": "SA[5.00s]",
      "unit_type": "g",
      "unit_description": "gravity, 1g = 980.5 cm/s/s"
    }
  ]
}

For which soil types is data available?

User query For which soil types are hazard curves available from the model of my interest, for the intensity measure type of my interest, at the site of my interest?
Request format /v1/curves/soiltypes?lat=[latitude]&lon=[longitude]&modelid=[modelid]&imt=[IMT]
Parameters
  • lat (required): latitude, −90 to 90
  • lon (required): longitude, −180 to 180
  • modelid (required): model identifier, from the model list
  • imt (required): intensity measure type, e.g. PGA or SA
Request example https://efehr-services.ethz.ch/hazard/api/v1/curves/soiltypes?lat=47.5&lon=7.6&modelid=81&imt=PGA
Response example 
{
  "soil_types": [
    {
      "code": "rock_vs30_800ms-1",
      "name": "rock_vs30_800ms-1"
    }
  ]
}

Hazard aggregation strategies from logic tree models

User query How was the hazard of a multi-branch logic tree model aggregated for the available curves? Answers are the arithmetic mean or quantiles (ordinal aggregation with levels from 0 to 1).
Request format /v1/curves/aggregations?lat=[latitude]&lon=[longitude]&modelid=[modelid]&imt=[IMT]&soiltype=[soiltype]
Parameters
  • lat (required): latitude, −90 to 90
  • lon (required): longitude, −180 to 180
  • modelid (required): model identifier, from the model list
  • imt (required): intensity measure type, e.g. PGA or SA
  • soiltype (optional): soil type code
Request example https://efehr-services.ethz.ch/hazard/api/v1/curves/aggregations?lat=47.5&lon=7.6&modelid=81&imt=PGA&soiltype=rock_vs30_800ms-1
Response example 
{
  "fractiles": [
    {
      "aggregation_type": "arithmetic",
      "aggregation_level": 0.5
    },
    {
      "aggregation_type": "ordinal",
      "aggregation_level": 0.05
    },
    {
      "aggregation_type": "ordinal",
      "aggregation_level": 0.16
    },
    {
      "aggregation_type": "ordinal",
      "aggregation_level": 0.5
    },
    {
      "aggregation_type": "ordinal",
      "aggregation_level": 0.84
    },
    {
      "aggregation_type": "ordinal",
      "aggregation_level": 0.95
    }
  ]
}

Retrieving a fully defined hazard curve

User query What is the hazard curve that matches all the above specifications?
Request format /v1/curves?lat=[latitude]&lon=[longitude]&modelid=[modelid]&imt=[IMT]&soiltype=[soiltype]&aggregationtype=[arithmetic | ordinal]&aggregationlevel=[0…1]
Parameters
  • lat (required): latitude, −90 to 90
  • lon (required): longitude, −180 to 180
  • modelid (required): model identifier, from the model list
  • imt (required): intensity measure type, e.g. PGA or SA[0.20s]
  • soiltype (optional): soil type code
  • aggregationtype (optional): arithmetic (mean) or ordinal (quantile)
  • aggregationlevel (optional): aggregation level, 0 to 1 (e.g. 0.5 for the median)
  • format (optional): json (default) or nrml
Request example https://efehr-services.ethz.ch/hazard/api/v1/curves?lat=47.5&lon=7.6&modelid=81&imt=PGA&soiltype=rock_vs30_800ms-1&aggregationtype=arithmetic&aggregationlevel=0.5
Response example 
{
  "curves": [
    {
      "lon": 7.5821339,
      "lat": 47.5,
      "model_id": 81,
      "model_name": "European Seismic hazard Model 2020 (ESHM20)",
      "imt": "PGA",
      "sa_period": null,
      "sa_damping": null,
      "aggregation_type": "arithmetic",
      "aggregation_level": 0.5,
      "soil_type": "rock_vs30_800ms-1",
      "investigation_time": 50,
      "points": [
        {
          "iml": 0.0005,
          "poe": 0.9996462464
        },
        {
          "iml": 0.0007184440843,
          "poe": 0.998726964
        },
        {
          "iml": 0.001032323804,
          "poe": 0.9958737493
        },
        "\u2026",
        {
          "iml": 0.1148985468,
          "poe": 0.07059025764
        },
        {
          "iml": 0.1650963624,
          "poe": 0.03948215023
        },
        {
          "iml": 0.2372250099,
          "poe": 0.02021309175
        },
        "\u2026",
        {
          "iml": 2.087845154,
          "poe": 3.724025373e-05
        },
        {
          "iml": 3.0,
          "poe": 7.184219157e-06
        }
      ]
    }
  ],
  "metadata": {
    "source": "EFEHR Services FastAPI",
    "timestamp": null
  }
}
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The hazard.EFEHR web platform and web services are developed, maintained and hosted by the Swiss Seismological Service (SED) at ETH Zurich under the umbrella of EFEHR, in collaboration with the GEM Foundation and EPOS (European Plate Observing System).

The work presented in this website has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreements No.s 730900, 676564 and 821115 of the projects SERA, EPOS-IP and RISE. The European Commission is not responsible for any use that may be made of the information contained in this website.