Santa Susana Details

PropertyValue
Rupture Count11,714
Ruptures w/ Nonzero Rates11,085
Magnitude Range[6.66, 8.38]
Length Range[19, 1,385] km
Total Rate0.0028507689 /yr
Multi-Fault Rate0.0019134674 /yr (67.12%)
Directly-Connected Faults10
All Co-Rupturing Faults126

Table Of Contents

Magnitude-Frequency Distribution

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Fault magnitude-frequency distributions. The left plot shows incremental rates (rates within each magnitude bin), and the right plot shows cumulative rates (rates at or above the given magnitude).

The smaller bottom panel shows the distribution of available ruptures with a green histogram and is not rate-weighted. It only shows the raw count of ruptures of various magnitudes available in the rupture set.

IncrementalCumulative
Incremental PlotCumulative Plot

NOTE: This solution has a distribution of magnitudes and rates for each ruptures, and is likely a branch-averaged solution. That full distribution for each rupture is used to construct the MFDs above, but only mean magnitudes are used in the lower panel showing available and utilized magnitudes, and thus there may be bins with nonzero rates in the top panel where no mgnitudes are shown in the bottom. The magnitude rage at the top of this page also only considers mean magnitudes.

Cumulative Rates and Recurrence Intervals Table

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MagnitudeParticipation RateRangeParticipation RI (yrs)Range
M≥6.50.0028507689[0.00E0, 1.56E-2]350.78[63.98, ∞]
M≥6.60.0027272352[0.00E0, 1.34E-2]366.67[74.86, ∞]
M≥6.70.0026661349[0.00E0, 1.34E-2]375.07[74.86, ∞]
M≥6.80.0024847721[0.00E0, 8.27E-3]402.45[120.85, ∞]
M≥6.90.0023329626[0.00E0, 8.27E-3]428.64[120.85, ∞]
M≥70.0022068056[0.00E0, 8.19E-3]453.14[122.11, ∞]
M≥7.10.0018742739[0.00E0, 6.42E-3]533.54[155.67, ∞]
M≥7.20.001503169[0.00E0, 4.03E-3]665.26[248.11, ∞]
M≥7.30.001320776[0.00E0, 2.86E-3]757.13[349.79, ∞]
M≥7.40.0011211109[0.00E0, 2.70E-3]891.97[370.95, ∞]
M≥7.57.437269E-4[0.00E0, 2.52E-3]1,344.58[396.96, ∞]
M≥7.65.177854E-4[0.00E0, 2.09E-3]1,931.3[477.98, ∞]
M≥7.73.2437986E-4[0.00E0, 1.92E-3]3,082.81[521.1, ∞]
M≥7.81.6421943E-4[0.00E0, 1.53E-3]6,089.41[651.9, ∞]
M≥7.95.4283282E-5[0.00E0, 5.95E-4]18,421.88[1,680.49, ∞]
M≥83.1497406E-5[0.00E0, 3.77E-4]31,748.64[2,653.93, ∞]
M≥8.12.0031377E-5[0.00E0, 3.77E-4]49,921.68[2,653.93, ∞]
M≥8.29.799997E-6[0.00E0, 3.77E-4]102,040.85[2,653.93, ∞]
M≥8.36.9568187E-6[0.00E0, 3.56E-4]143,743.87[2,808.99, ∞]
M≥8.41.7309977E-6[0.00E0, 1.39E-4]577,701.49[7,194.24, ∞]
M≥8.52.9995564E-7[0.00E0, 7.63E-5]3,333,826.39[13,099.29, ∞]

Individual Branch Nucleation MFDs

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Individual nucleation MFDs across 2250 logic tree branches. The individual branches with the highest and lowest total rate are highlighted, as are the mean and median models.

IncrementalCumulative
Incremental PlotCumulative Plot

Along-Strike Values

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Along-strike plot

Moment-Rates and b-Values

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Along-strike plot

Length Distributions

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Fault rupture length distributions. The top panel shows the raw count of ruptures in which Santa Susana participates in the rupture set as a function of rupture length. The bottom two panels show the rate-weighted distribution (i.e., the distribution of lengths in the solution). The middle panel is plotted with a linear scale, and the bottom paney a logarithmic scale.

Length Hist

Rupture Examples

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The following table includes example ruptures, selected at various percentiles from the rate-weighted rupture length distribution. So, for example, the rupture with length closest to the median length (again, rate-weighted) is plotted in the first column ('p50 Example'). The longest participating rupture is plotted last ('p100 Example').

It is important to note that the rupture examples here may not be representative, and may have negligible rates. They are included for illustration purposes only.

p50 Example

p75 Example

p90 Example
Rupture 496939Rupture 450627Rupture 101929

p97.5 Example

p99 Example

p100 Example

Rupture 513042Rupture 477327Rupture 477806

Connectivity

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Map

Nearby Sections

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Fault SectionFault Section
Santa Susana (east, connector), 0.11 km awaySan Gabriel, 0.89 km away
Northridge Hills, 0.14 km awayMission Hills, 2.04 km away
Northridge, 0.27 km awaySan Cayetano, 2.65 km away
Oak Ridge (onshore), 0.33 km awaySimi - Santa Rosa, 4.7 km away
Holser, 0.34 km awaySan Gabriel (extension), 5.38 km away
Sierra Madre (San Fernando), 0.34 km awayVerdugo, 6.42 km away
Holser - San Gabriel (connector), 0.35 km awaySierra Madre, 6.62 km away
Del Valle, 0.4 km awaySanta Ynez (east), 11.92 km away

Santa Susana (east, connector), 0.11 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.11 km
Min Rate-Weighted Dist0.11 km
Co-rupture Count3,061
Co-rupture Rate7.5902656E-4
Co-rupture Mag Range[6.77, 8.38]

Northridge Hills, 0.14 km away

(back to table)

NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.14 km
Min Rate-Weighted Dist0.14 km
Co-rupture Count2,165
Co-rupture Rate8.8132794E-5
Co-rupture Mag Range[7.15, 8.28]

Northridge, 0.27 km away

(back to table)

NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.27 km
Min Rate-Weighted Dist0.57 km
Co-rupture Count4,157
Co-rupture Rate4.452951E-4
Co-rupture Mag Range[6.88, 8.16]

Oak Ridge (onshore), 0.33 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count161
Co-rupture Rate2.79551E-5
Co-rupture Mag Range[7.47, 8.07]

Holser, 0.34 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count88
Co-rupture Rate3.2183703E-5
Co-rupture Mag Range[7.24, 7.99]

Sierra Madre (San Fernando), 0.34 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.34 km
Min Rate-Weighted Dist0.38 km
Co-rupture Count7,361
Co-rupture Rate4.5921773E-4
Co-rupture Mag Range[6.89, 8.38]

Holser - San Gabriel (connector), 0.35 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.35 km
Min Rate-Weighted Dist1.41 km
Co-rupture Count135
Co-rupture Rate3.3355926E-5
Co-rupture Mag Range[7.00, 7.99]

Del Valle, 0.4 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count207
Co-rupture Rate1.7355947E-5
Co-rupture Mag Range[7.22, 8.28]

San Gabriel, 0.89 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.89 km
Min Rate-Weighted Dist0.89 km
Co-rupture Count865
Co-rupture Rate1.3638246E-4
Co-rupture Mag Range[6.92, 8.38]

Mission Hills, 2.04 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist2.04 km
Min Rate-Weighted Dist2.19 km
Co-rupture Count201
Co-rupture Rate3.817493E-4
Co-rupture Mag Range[6.96, 7.97]

San Cayetano, 2.65 km away

(back to table)

NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist2.65 km
Min Rate-Weighted Dist2.65 km
Co-rupture Count8,165
Co-rupture Rate0.0010803269
Co-rupture Mag Range[7.05, 8.38]

Simi - Santa Rosa, 4.7 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist4.7 km
Min Rate-Weighted Dist4.71 km
Co-rupture Count485
Co-rupture Rate7.8397556E-5
Co-rupture Mag Range[6.97, 7.95]

San Gabriel (extension), 5.38 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist5.38 km
Min Rate-Weighted Dist6.31 km
Co-rupture Count331
Co-rupture Rate4.3614196E-5
Co-rupture Mag Range[6.92, 8.07]

Verdugo, 6.42 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count1,749
Co-rupture Rate1.0970685E-4
Co-rupture Mag Range[6.99, 8.07]

Sierra Madre, 6.62 km away

(back to table)

NSHM23
Connected?true
Directly Connected?false
Co-rupture Count7,872
Co-rupture Rate1.6144027E-4
Co-rupture Mag Range[7.07, 8.38]

Santa Ynez (east), 11.92 km away

(back to table)

NSHM23
Connected?true
Directly Connected?false
Co-rupture Count2,989
Co-rupture Rate8.2244595E-5
Co-rupture Mag Range[7.49, 8.38]