{
  "run": "032-gutenberg-richter",
  "as_of": "2026-08-03",
  "source": "USGS earthquake catalog, fdsnws-event count and query endpoints (earthquake.usgs.gov/fdsnws/event/1/)",
  "gr_law": {
    "n_events_m4_5": 229153,
    "b_value_core": {
      "range": "M4.5-7.5",
      "n": 31,
      "slope": -1.0319,
      "intercept": 9.9542,
      "r2": 0.9993,
      "p": 3.624916107285449e-47,
      "slope_ci95": [
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        -1.0214
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    },
    "full_range_fit": {
      "range": "M4.5-8.5",
      "n": 41,
      "slope": -1.0866,
      "intercept": 10.2672,
      "r2": 0.9954,
      "p": 3.444832452876913e-47,
      "slope_ci95": [
        -1.1105,
        -1.0627
      ]
    },
    "rolloff_beyond_m7_5": [
      {
        "min_magnitude": 7.6,
        "count_geq": 146,
        "predicted_N": 129.35,
        "pct_of_predicted": 112.9
      },
      {
        "min_magnitude": 7.7,
        "count_geq": 107,
        "predicted_N": 101.99,
        "pct_of_predicted": 104.9
      },
      {
        "min_magnitude": 7.8,
        "count_geq": 77,
        "predicted_N": 80.42,
        "pct_of_predicted": 95.7
      },
      {
        "min_magnitude": 7.9,
        "count_geq": 49,
        "predicted_N": 63.41,
        "pct_of_predicted": 77.3
      },
      {
        "min_magnitude": 8.0,
        "count_geq": 34,
        "predicted_N": 50.0,
        "pct_of_predicted": 68.0
      },
      {
        "min_magnitude": 8.1,
        "count_geq": 26,
        "predicted_N": 39.43,
        "pct_of_predicted": 65.9
      },
      {
        "min_magnitude": 8.2,
        "count_geq": 18,
        "predicted_N": 31.09,
        "pct_of_predicted": 57.9
      },
      {
        "min_magnitude": 8.3,
        "count_geq": 12,
        "predicted_N": 24.51,
        "pct_of_predicted": 48.9
      },
      {
        "min_magnitude": 8.4,
        "count_geq": 8,
        "predicted_N": 19.33,
        "pct_of_predicted": 41.4
      },
      {
        "min_magnitude": 8.5,
        "count_geq": 6,
        "predicted_N": 15.24,
        "pct_of_predicted": 39.4
      }
    ]
  },
  "frequency": {
    "annual_trend_full": {
      "n": 76,
      "slope": 0.0828,
      "intercept": -151.6497,
      "r2": 0.1867,
      "p": 9.72732242726823e-05,
      "slope_ci95": [
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        0.1229
      ]
    },
    "annual_trend_pre_1990": {
      "n": 40,
      "slope": 0.0605,
      "intercept": -108.0927,
      "r2": 0.0347,
      "p": 0.24996448853957792,
      "slope_ci95": [
        -0.0443,
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    },
    "annual_trend_post_1990": {
      "n": 36,
      "slope": -0.0359,
      "intercept": 87.1118,
      "r2": 0.0103,
      "p": 0.5553328083807916,
      "slope_ci95": [
        -0.1584,
        0.0866
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    },
    "era_split": {
      "pre_1990_mean": 11.07,
      "pre_1990_n_years": 40,
      "post_1990_mean": 15.03,
      "post_1990_n_years": 36,
      "welch_t": 4.578,
      "p": 0.0
    },
    "overall_mean_per_year": 12.95,
    "overall_sd_per_year": 4.23
  },
  "overdue": {
    "n_events": 507,
    "n_gaps": 506,
    "mean_gap_days": 91.2,
    "sd_gap_days": 97.2,
    "coefficient_of_variation": 1.066,
    "ks_stat_vs_exponential": 0.0545,
    "ks_p": 0.095,
    "consecutive_gap_autocorr": 0.0618,
    "consecutive_gap_autocorr_p": 0.166,
    "longest_gap_days": 852.1,
    "shortest_gap_days": 0.0,
    "current_gap_days": 62.8
  }
}