Generating page for event ci38457511...
7.1, 18km W of Searles Valley, CA
Disclaimer: This information is intended solely for research and should not be used for communications with the media or the public.
Table Of Contents
Mainshock Details
(top)
Information and plots in the section are taken from the USGS event page, accessed through ComCat.
| Field | Value |
|---|
| Magnitude | 7.1 (mw) |
| Time (UTC) | Sat, 6 Jul 2019 03:19:53 UTC |
| Time (UTC) | Sat, 6 Jul 2019 03:19:53 UTC |
| Location | 35.7695, -117.599335 |
| Depth | 8.0 km |
| Status | reviewed |
USGS Products
(top)
Nearby Faults
(top)
1 UCERF3 fault section is within 10km of this event's hypocenter:
Sequence Details
(top)
These plots show the aftershock sequence, using data sourced from ComCat. They were last updated at 2023/01/30 23:32:00 UTC, 1304.84 days after the mainshock.
7456 M≥2 earthquakes within 95.51 km of the mainshock's epicenter.
| First Hour | First Day | First Week | First Month | To Date |
|---|
| M 2 | 237 | 2229 | 3810 | 4956 | 7456 |
| M 3 | 224 | 610 | 791 | 909 | 1162 |
| M 4 | 43 | 65 | 77 | 83 | 101 |
| M 5 | 2 | 2 | 2 | 2 | 4 |
Magnitude Vs. Time Plot
(top)
This plot shows the magnitude vs. time evolution of the sequence. The mainshock is ploted as a brown circle, foreshocks are plotted as magenta circles, and aftershocks are plotted as cyan circles.
| First Week | First Month | To Date |
|---|
 |  |  |
Aftershock Locations
(top)
Map view of the aftershock sequence, plotted as cyan circles. The mainshock and foreshocks are plotted below in brown and magenta circles respectively, but may be obscured by aftershocks. Nearby UCERF3 fault traces are plotted in gray lines, and the region used to fetch aftershock data in a dashed dark gray line.
| First Day | First Week | To Date |
|---|
 |  |  |
Cumulative Number Plot
(top)
This plot shows the cumulative number of M≥2 aftershocks as a function of time since the mainshock.
Magnitude-Number Distributions (MNDs)
(top)
These plot shows the magnitude-number distribution of the aftershock sequence thus far. The left plot gives an incremental distribution (the count in each magnitude bin), and the right plot a cumulative distribution (the count in or above each magnitude bin).
| Incremental MND | Cumulative MND |
|---|
 |  |
Significant Foreshocks
(top)
Foreshock(s) with M≥6 or with M≥MMainshock-1.
M6.4 1.41 days before
(top)
Information and plots in the section are taken from the USGS event page, accessed through ComCat.
| Field | Value |
|---|
| Magnitude | 6.4 (mw) |
| Time (UTC) | Sat, 6 Jul 2019 03:19:53 UTC |
| Time (UTC) | Sat, 6 Jul 2019 03:19:53 UTC |
| Location | 35.705334, -117.50383 |
| Depth | 10.5 km |
| Status | reviewed |
USGS Products
(top)
Nearby Faults
(top)
No UCERF3 fault sections are within 10km of this event's hypocenter.
UCERF3-ETAS Forecast
UCERF3-ETAS Forecast
(top)
This section gives results from the UCERF3-ETAS short-term forecasting model. This model is described in Field et al. (2017), and computes probabilities of this sequence triggering subsequent aftershocks, including events on known faults.
Probabilities are inherantly time-dependent. Those stated here are for time periods beginning the instant when this report was generated, 2020/05/28 14:00:04 PDT. The model was updated with all observed aftershcoks up to 327.6 days after the mainshock, and may be out of date, especially if large aftershocks have occurred subsequently or a significant amount of time has passed since the last update.
Results are summarized below and should be considered preliminary. The exact timing, size, location, or number of aftershocks cannot be predicted, and all probabilities are uncertain.
This table gives forecasted one week and one month probabilities for events triggered by this sequence; it does not include the long-term probability of such events.
| 1 Week | 1 Month |
|---|
| M≥3 | 77.738% | 99.780% |
| M≥4 | 14.856% | 48.700% |
| M≥5 | 1.673% | 6.942% |
| M≥6 | 0.154% | 0.633% |
| M≥7 | 0.013% | 0.044% |
| M≥8 | <0.001% | <0.001% |
ETAS Forecasted Magnitude Vs. Time
(top)
These plots show the show the magnitude versus time probability function since simulation start. Observed event data lie on top, with those input to the simulation plotted as magenta circles and those that occurred after the simulation start time as cyan circles. Time is relative to the mainshock (M7.1, ci38457511, plotted as a brown circle). Probabilities are only shown above the minimum simulated magnitude, M=2.5.
| One Week | One Month |
|---|
 |  |
ETAS Spatial Distribution Forecast
(top)
These plots show the predicted spatial distribution of aftershocks above the given magnitude threshold and for the given time period. The 'Current' plot shows the forecasted spatial distribution to date, along with as any observed aftershocks overlaid with cyan circles. Observed aftershocks will be included in the week/month plots as well if the forecasted time window has elapsed.
| Forecast: 1 Week | Forecast: 1 Month |
|---|
| M≥3 |  |  |
| M≥5 |  |  |
ETAS Fault Trigger Probabilities
(top)
The table below summarizes the probabilities of this sequence triggering large supra-seismogenic aftershocks on nearby known active faults.
| Fault Section | 1 wk supra-seis prob | 1 mo supra-seis prob | 1 wk M≥7 prob | 1 mo M≥7 prob |
|---|
| Garlock (Central) | 0.020% | 0.080% | 0.008% | 0.029% |
| Tank Canyon | 0.006% | 0.052% | 0.001% | 0.001% |
| Little Lake | 0.013% | 0.053% | 0.002% | 0.005% |
| Airport Lake | 0.013% | 0.042% | 0.001% | 0.004% |
| Owl Lake | 0.005% | 0.016% | 0.002% | 0.007% |
| Panamint Valley | 0.006% | 0.019% | 0.004% | 0.011% |
| Garlock (East) | 0.004% | 0.012% | 0.003% | 0.010% |
| Ash Hill | 0.003% | 0.011% | <0.001% | <0.001% |
| Hunter Mountain-Saline Valley | 0.002% | 0.009% | 0.002% | 0.008% |
| Blackwater | 0.001% | 0.002% | <0.001% | <0.001% |
Pre Event Seismicity Results
(top)
Figure 1. Seismicity Map
Map view of earthquakes (circles) with magnitude M2.0+ that occurred within 3 months and within 5 rupture lengths from the event considered (star). Circle size is proportional to magnitude (see legend) and color represents the time prior to the event considered (see colorbar).
Figure 2. Magnitude (with b-value estimation) vs. Time
Magnitude (left axis) and b-value (right axis) vs. time of earthquakes in the seismicity map prior to the event considered (star). Color represents distance to the event (see colorbar). The b-value (gray line) is estimated within a sliding window of 20 days; results are only reported for windows with >5 events. The gray dashed lines correspond to a 95% CI for the b-value. The b-value estimation and confidence intervals are according to Tinti and Mulargia (1987).
Figure 3. Distance vs. Time
Distance (left axis) vs. time of earthquakes in the seismicity map prior to the event considered (star). Color represents hypocentral depth (see colorbar). The gray line shows distance to event considered averaged within sliding time window of 20 events.
Figure 4. (Depth vs. Time)
Hypocentral depth (left axis) vs. time of earthquakes in the seismicity map prior to the event considered (star). Color represents distance to the event considered (see colorbar). The gray line shows the depth averaged within sliding time window of 20 events.
Figure 5. Nearest-Neighbor Tree Graph
Tree graph representing nearest-neighbor connections (gray lines) among the earthquakes in the seismicity map prior to the event considered (star). Y-axis represents ranked time (from top to bottom). X-coordinates of events are calculated for proper visual embedding of the tree in the plane and do not represent a physical characteristic. Color represents distance to the event considered (see colorbar). The combinatorial depth of the tree (number of generations) and the average leaf depth are marked. The results are based on the methodology of Zaliapin and Ben-Zion (2013).
