Northridge Details

PropertyValue
Rupture Count7,853
Ruptures w/ Nonzero Rates7,678
Magnitude Range[6.42, 8.31]
Length Range[13, 1,240] km
Total Rate9.797767E-4 /yr
Multi-Fault Rate6.5694714E-4 /yr (67.05%)
Directly-Connected Faults14
All Co-Rupturing Faults120

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≥6.29.797767E-4[0.00E0, 1.22E-2]1,020.64[81.69, ∞]
M≥6.39.2281186E-4[0.00E0, 8.87E-3]1,083.64[112.71, ∞]
M≥6.48.950232E-4[0.00E0, 8.17E-3]1,117.29[122.4, ∞]
M≥6.58.0300006E-4[0.00E0, 4.91E-3]1,245.33[203.79, ∞]
M≥6.67.7328086E-4[0.00E0, 4.77E-3]1,293.19[209.64, ∞]
M≥6.77.271929E-4[0.00E0, 4.77E-3]1,375.15[209.64, ∞]
M≥6.86.743177E-4[0.00E0, 4.21E-3]1,482.98[237.81, ∞]
M≥6.96.2967464E-4[0.00E0, 4.18E-3]1,588.12[239.29, ∞]
M≥76.033746E-4[0.00E0, 4.14E-3]1,657.35[241.6, ∞]
M≥7.15.6121906E-4[0.00E0, 2.88E-3]1,781.84[347.26, ∞]
M≥7.24.980595E-4[0.00E0, 2.88E-3]2,007.79[347.26, ∞]
M≥7.34.4532237E-4[0.00E0, 2.51E-3]2,245.56[398.85, ∞]
M≥7.43.9534978E-4[0.00E0, 2.51E-3]2,529.41[399.14, ∞]
M≥7.53.3840214E-4[0.00E0, 2.43E-3]2,955.06[411.45, ∞]
M≥7.62.4577047E-4[0.00E0, 2.08E-3]4,068.84[481.34, ∞]
M≥7.71.3048729E-4[0.00E0, 1.53E-3]7,663.58[654.71, ∞]
M≥7.85.3928845E-5[0.00E0, 9.27E-4]18,542.95[1,078.5, ∞]
M≥7.91.0221348E-5[0.00E0, 3.14E-4]97,834.46[3,184.55, ∞]
M≥81.4025577E-6[0.00E0, 6.18E-5]712,983.17[16,174.61, ∞]
M≥8.12.0420555E-7[0.00E0, 2.60E-5]4,897,026.71[38,520.8, ∞]
M≥8.21.0741195E-8[0.00E0, 3.25E-6]93,099,511.39[307,787.01, ∞]
M≥8.33.5539133E-10[0.00E0, 1.15E-6]2,813,799,702.9[865,800.9, ∞]
M≥8.41.2649313E-19[0.00E0, 9.85E-16]7,905,567,618,797,768,700[1,014,795,150,177,735.5, ∞]

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

(top)

Along-strike plot

Moment-Rates and b-Values

(top)

Along-strike plot

Length Distributions

(top)

Fault rupture length distributions. The top panel shows the raw count of ruptures in which Northridge 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

(top)

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 286345Rupture 496991Rupture 286485

p97.5 Example

p99 Example

p100 Example

Rupture 322599Rupture 487794Rupture 247451

Connectivity

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Map

Nearby Sections

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Fault SectionFault Section
Mission Hills, 0.16 km awayNorth Salt Lake, 4.1 km away
Northridge Hills, 0.22 km awayHollywood, 6.05 km away
Del Valle, 0.26 km awaySan Gabriel, 7.24 km away
Santa Susana, 0.27 km awaySan Vicente, 8.19 km away
Verdugo, 0.27 km awaySan Cayetano, 8.24 km away
Holser, 0.28 km awayAnacapa - Dume, 8.74 km away
Holser - San Gabriel (connector), 0.35 km awaySierra Madre, 9.59 km away
Simi - Santa Rosa, 0.42 km awaySanta Monica, 9.73 km away
Oak Ridge (onshore), 0.43 km awaySanta Monica Bay, 9.79 km away
Sierra Madre (San Fernando), 0.63 km awaySan Gabriel (extension), 10.26 km away
Compton, 0.77 km awayElysian Park (upper), 13.93 km away
Santa Susana (east, connector), 2.34 km awayPuente Hills (Los Angeles), 14.49 km away
San Pedro Escarpment, 3.86 km away

Mission Hills, 0.16 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.16 km
Min Rate-Weighted Dist0.2 km
Co-rupture Count233
Co-rupture Rate5.554907E-5
Co-rupture Mag Range[6.75, 7.92]

Northridge Hills, 0.22 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.22 km
Min Rate-Weighted Dist0.57 km
Co-rupture Count386
Co-rupture Rate7.2947487E-6
Co-rupture Mag Range[7.04, 8.29]

Del Valle, 0.26 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.26 km
Min Rate-Weighted Dist0.26 km
Co-rupture Count95
Co-rupture Rate2.9537397E-5
Co-rupture Mag Range[6.69, 7.93]

Santa Susana, 0.27 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.27 km
Min Rate-Weighted Dist0.57 km
Co-rupture Count4,166
Co-rupture Rate4.5755765E-4
Co-rupture Mag Range[6.88, 8.16]

Verdugo, 0.27 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.27 km
Min Rate-Weighted Dist0.27 km
Co-rupture Count2,065
Co-rupture Rate2.987604E-5
Co-rupture Mag Range[6.75, 8.07]

Holser, 0.28 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.28 km
Min Rate-Weighted Dist0.28 km
Co-rupture Count864
Co-rupture Rate7.408453E-5
Co-rupture Mag Range[6.84, 8.31]

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 Dist0.37 km
Co-rupture Count339
Co-rupture Rate2.3321936E-5
Co-rupture Mag Range[6.61, 7.97]

Simi - Santa Rosa, 0.42 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.42 km
Min Rate-Weighted Dist0.42 km
Co-rupture Count861
Co-rupture Rate5.0290866E-5
Co-rupture Mag Range[6.75, 7.98]

Oak Ridge (onshore), 0.43 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.43 km
Min Rate-Weighted Dist2.04 km
Co-rupture Count308
Co-rupture Rate7.528685E-5
Co-rupture Mag Range[6.90, 7.98]

Sierra Madre (San Fernando), 0.63 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.63 km
Min Rate-Weighted Dist0.64 km
Co-rupture Count2,458
Co-rupture Rate1.5733956E-4
Co-rupture Mag Range[6.75, 8.31]

Compton, 0.77 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist0.77 km
Min Rate-Weighted Dist0.77 km
Co-rupture Count1,985
Co-rupture Rate1.9085874E-4
Co-rupture Mag Range[7.09, 8.03]

Santa Susana (east, connector), 2.34 km away

(back to table)

NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist2.34 km
Min Rate-Weighted Dist2.34 km
Co-rupture Count417
Co-rupture Rate2.2910627E-4
Co-rupture Mag Range[6.94, 8.00]

San Pedro Escarpment, 3.86 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist3.86 km
Min Rate-Weighted Dist3.86 km
Co-rupture Count625
Co-rupture Rate1.3564461E-6
Co-rupture Mag Range[7.28, 8.01]

North Salt Lake, 4.1 km away

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NSHM23
Connected?true
Directly Connected?true
Min Co-Rupture Dist4.1 km
Min Rate-Weighted Dist4.1 km
Co-rupture Count144
Co-rupture Rate7.388582E-7
Co-rupture Mag Range[6.54, 7.90]

Hollywood, 6.05 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count151
Co-rupture Rate7.083079E-7
Co-rupture Mag Range[6.98, 7.98]

San Gabriel, 7.24 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count387
Co-rupture Rate1.0296744E-5
Co-rupture Mag Range[6.89, 8.05]

San Vicente, 8.19 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count29
Co-rupture Rate8.446388E-7
Co-rupture Mag Range[7.20, 7.82]

San Cayetano, 8.24 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count2,873
Co-rupture Rate2.3821558E-4
Co-rupture Mag Range[7.07, 8.16]

Anacapa - Dume, 8.74 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count121
Co-rupture Rate7.7853923E-7
Co-rupture Mag Range[7.39, 7.98]

Sierra Madre, 9.59 km away

(back to table)

NSHM23
Connected?true
Directly Connected?false
Co-rupture Count3,229
Co-rupture Rate1.6890444E-5
Co-rupture Mag Range[6.89, 8.31]

Santa Monica, 9.73 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count139
Co-rupture Rate4.1552607E-6
Co-rupture Mag Range[7.34, 8.01]

Santa Monica Bay, 9.79 km away

(back to table)

NSHM23
Connected?false
Directly Connected?false
Co-rupture Count0
Co-rupture RateN/A

San Gabriel (extension), 10.26 km away

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NSHM23
Connected?true
Directly Connected?false
Co-rupture Count153
Co-rupture Rate1.2700472E-6
Co-rupture Mag Range[7.20, 8.07]

Elysian Park (upper), 13.93 km away

(back to table)

NSHM23
Connected?true
Directly Connected?false
Co-rupture Count54
Co-rupture Rate2.9679557E-6
Co-rupture Mag Range[7.18, 7.79]

Puente Hills (Los Angeles), 14.49 km away

(back to table)

NSHM23
Connected?true
Directly Connected?false
Co-rupture Count351
Co-rupture Rate2.7641567E-5
Co-rupture Mag Range[7.11, 7.98]