Santa Susana Details

PropertyValue
Rupture Count30,247
Ruptures w/ Nonzero Rates28,947
Magnitude Range[6.66, 8.38]
Length Range[19, 1,385] km
Total Rate0.0028696873 /yr
Multi-Fault Rate0.0019716755 /yr (68.71%)
Directly-Connected Faults10
All Co-Rupturing Faults130

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≥6.50.0028696873[0.00E0, 1.56E-2]348.47[63.98, ∞]
M≥6.60.002754658[0.00E0, 1.34E-2]363.02[74.86, ∞]
M≥6.70.0026906808[0.00E0, 1.34E-2]371.65[74.86, ∞]
M≥6.80.0025084228[0.00E0, 8.28E-3]398.66[120.77, ∞]
M≥6.90.0023572375[0.00E0, 8.28E-3]424.23[120.77, ∞]
M≥70.0022217059[0.00E0, 8.21E-3]450.1[121.85, ∞]
M≥7.10.0018753065[0.00E0, 6.42E-3]533.25[155.67, ∞]
M≥7.20.0015021717[0.00E0, 4.09E-3]665.7[244.59, ∞]
M≥7.30.0013312916[0.00E0, 2.71E-3]751.15[369.06, ∞]
M≥7.40.0011682862[0.00E0, 2.52E-3]855.95[397.52, ∞]
M≥7.58.4202626E-4[0.00E0, 2.42E-3]1,187.61[413.71, ∞]
M≥7.66.17471E-4[0.00E0, 2.18E-3]1,619.51[457.88, ∞]
M≥7.73.8152197E-4[0.00E0, 1.98E-3]2,621.08[506.03, ∞]
M≥7.82.1264402E-4[0.00E0, 1.63E-3]4,702.7[615.27, ∞]
M≥7.99.871731E-5[0.00E0, 9.01E-4]10,129.94[1,110.03, ∞]
M≥84.6859393E-5[0.00E0, 5.23E-4]21,340.44[1,912.41, ∞]
M≥8.12.5519834E-5[0.00E0, 3.74E-4]39,185.21[2,671.65, ∞]
M≥8.28.919306E-6[0.00E0, 3.49E-4]112,116.34[2,862.05, ∞]
M≥8.35.569051E-6[0.00E0, 3.49E-4]179,563.81[2,862.05, ∞]
M≥8.41.1443097E-6[0.00E0, 1.28E-4]873,889.26[7,836.99, ∞]
M≥8.52.1520985E-7[0.00E0, 6.90E-5]4,646,627.55[14,501.16, ∞]

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 542097Rupture 540103Rupture 352471

p97.5 Example

p99 Example

p100 Example

Rupture 541824Rupture 453145Rupture 500596

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 Count7,363
Co-rupture Rate7.297711E-4
Co-rupture Mag Range[6.77, 8.38]

Northridge Hills, 0.14 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.14 km
Min Rate-Weighted Dist0.14 km
Co-rupture Count5,519
Co-rupture Rate1.3293413E-4
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 Count9,499
Co-rupture Rate4.4376648E-4
Co-rupture Mag Range[6.88, 8.20]

Oak Ridge (onshore), 0.33 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count81
Co-rupture Rate1.2435231E-5
Co-rupture Mag Range[7.47, 7.99]

Holser, 0.34 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count115
Co-rupture Rate1.5300879E-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 Dist0.37 km
Co-rupture Count17,870
Co-rupture Rate5.0579524E-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 Dist1.26 km
Co-rupture Count690
Co-rupture Rate2.3721574E-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 Count342
Co-rupture Rate2.235817E-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 Count2,353
Co-rupture Rate1.3204571E-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 Dist2.17 km
Co-rupture Count412
Co-rupture Rate3.854889E-4
Co-rupture Mag Range[6.96, 7.97]

San Cayetano, 2.65 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist2.65 km
Min Rate-Weighted Dist2.65 km
Co-rupture Count27,031
Co-rupture Rate0.0011420436
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 Dist4.75 km
Co-rupture Count842
Co-rupture Rate9.7007454E-5
Co-rupture Mag Range[6.97, 8.18]

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 Dist6.25 km
Co-rupture Count639
Co-rupture Rate5.130185E-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 Count3,467
Co-rupture Rate1.07495194E-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 Count17,933
Co-rupture Rate2.2263093E-4
Co-rupture Mag Range[7.07, 8.38]

Santa Ynez (east), 11.92 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count3,281
Co-rupture Rate3.793301E-5
Co-rupture Mag Range[7.49, 8.38]