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Strong mag. 6.4 earthquake - 10km ENE of Ridgecrest, CA (USA) on Thursday, 4 July 2019 - information

Very strong mag. 6.4 earthquake - 10.9 mi northeast of Ridgecrest, Kern County, California, USA, on 2019-07-04 09:33:49 -08:00

This quake was likely a foreshock of the 7.1 quake 10.9 mi north of Ridgecrest, Kern County, California, USA, 2019-07-05 20:19:53 -07:00, which followed after 1 day 10 hours.
Very strong mag. 6.4 earthquake - 10.9 mi northeast of Ridgecrest, Kern County, California, USA, on 2019-07-04 09:33:49 -08:00 Very strong mag. 6.4 earthquake - 10.9 mi northeast of Ridgecrest, Kern County, California, USA, on 2019-07-04 09:33:49 -08:00

Very strong magnitude 6.4 earthquake at 11 km depth

4 Jul 17:37 UTC: First to report: USGS after 3 minutes.
Jul 4 17:44: Magnitude recalculated from 6.6 to 6.4.
Hypocenter depth recalculated from 8.7 to 10.7 km.
Hypocenter depth recalculated from 10.7 to 4.8 km.
Hypocenter depth recalculated from 4.8 to 4.6 km.

Earthquake details

Date & timeJul 4, 2019 17:33:49 UTC
Local time at epicenter2019-07-04 09:33:49 -08:00
StatusConfirmed
Magnitude6.4
Depth10.7 km
Epicenter latitude / longitude35.70517°N / 117.506°W (San Bernardino, California, United States)
Antipode35.705°S / 62.494°E
Shaking intensityModerate shaking
Felt1786 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoCoso (46 km / 29 mi)
Nearby towns and cities12 km (7 mi) SW of Searles Valley (pop: 1,740) | Show on map | Quakes nearby
18 km (11 mi) ENE of Ridgecrest (pop: 28,800) | Show on map | Quakes nearby
78 km (48 mi) NNE of California City (Kern County) (pop: 13,300) | Show on map | Quakes nearby
100 km (62 mi) NNW of Barstow (pop: 23,700) | Show on map | Quakes nearby
126 km (78 mi) NNE of Lancaster (pop: 161,100) | Show on map | Quakes nearby
131 km (82 mi) N of Victorville (pop: 122,200) | Show on map | Quakes nearby
137 km (85 mi) NNE of Palmdale (pop: 158,400) | Show on map | Quakes nearby
142 km (88 mi) ENE of Bakersfield (pop: 373,600) | Show on map | Quakes nearby
196 km (122 mi) NNE of Los Angeles (pop: 3,971,900) | Show on map | Quakes nearby
477 km (296 mi) SE of Sacramento (pop: 490,700) | Show on map | Quakes nearby
Estimated seismic energy released2.5 x 1014 joules (69.8 gigawatt hours, equivalent to 60036 tons of TNT or 3.8 atomic bombs!) | about seismic energy
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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
Mag.DepthLocationSource
6.410.7 km12km SW of Searles Valley, CA (USA)USGS
6.59 kmSouthern California (USA)EMSC
6.410 kmCentral California (USA)GFZ
6.310 kmCentral California, United States [Land: United States] (USA)INGV
6.410 kmCentral California (USA)GeoAu
5.910 kmCentral California (USA)BMKG

Seismograms

Seismic station: Art Center College of Design (GSN-affiliate) (PASC/CI network) | Distance from quake: 181 km / 113 mi | Show on map | Station Info
Seismic station Art Center College of Design (GSN-affiliate): vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
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User reports for this quake (2590)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Fresno ca / Light shaking (MMI IV)
Vista Santa Rosa, Riverside, California (259.7 km SSE of epicenter) [Map] / Moderate shaking (MMI V) : Steady rolling movement seemed to have continued for quite a while. Between light and moderate shaking. Nothing broken but was felt by all including those sleeping. New cracks in stucco and plaster.  
YUCCA VALLEY / Light shaking (MMI IV)
Bakersfield CA / Light shaking (MMI IV) : I was asleep and my bed started shaking. It felt like jello!!! I woke me up and I'm not a light sleeper.  
Laguna Beach, CA / Light shaking (MMI IV)
Aliso Viejo, CA (245.1 km S of epicenter) [Map] / Light shaking (MMI IV)
Irvine California / Moderate shaking (MMI V)
Inglewood, Los Angeles, California (205.2 km SSW of epicenter) [Map] / Strong shaking (MMI VI)
Las Vegas, in the 4th floor of a hotel / Weak shaking (MMI III) : the 6.4 quake was 125mi from where I was, but it shook the room, rattled the hangers and I heard creaks. I evacuated the hotel by the stairs concerned about it getting worse.  
Imperial Beach (339.5 km S of epicenter) [Map] / Light shaking (MMI IV) : Rolling waves, like on a boat for about 5-10 seconds  
Fort Irwin, San Bernardino, California (88.3 km SE of epicenter) [Map] / Light shaking (MMI IV)
CLAREMONT / Light shaking (MMI IV) : There was very brief shaking here but lots of rolling everyone standing at work said they thought they were getting dizzy  
91350 / Moderate shaking (MMI V)
March Air Force Base, Riverside, California (199.6 km S of epicenter) [Map] / Moderate shaking (MMI V) (reported through our app)
Claremont, Los Angeles county, Ca (206.1 km SSE of epicenter) [Map] / Moderate shaking (MMI V) : Rolling wave motion swinging chandelier other hanging lights and small saucepans over gas stovetop, smooth motion no cracks, maybe 15 Seconds, moderate motion, I sat estimating a 5.5.  
Newport Beach / Light shaking (MMI IV) : More of a rock and roll than a shake. Surprising how long it lasted.  
Lodi, CA (429.3 km NW of epicenter) [Map] / Very weak shaking (MMI II) : Weird sensation like light headed and dizzy while sitting on the couch watching Stranger Things. No one else felt it so I thought it was my imagination. We were watching it on a projector screen and the screen was moving. We thought it was the fan. I was   
Duarte, CA / Light shaking (MMI IV)
Ladera ranch California 92694 / Light shaking (MMI IV) : Light shaking  
Needles california / Very weak shaking (MMI II)
Santa Clarita CA / Light shaking (MMI IV)
March Air Force Base, Riverside, California (199.9 km S of epicenter) [Map] / Light shaking (MMI IV) (reported through our app)
Tehachapi (107.3 km SW of epicenter) [Map] / Very strong shaking (MMI VII) : It sounded like the doors were banging.  
Riverside (196.4 km S of epicenter) [Map] / Weak shaking (MMI III)
Torrance, CA / Light shaking (MMI IV)
Oildale, Kern, California (133.8 km WSW of epicenter) [Map] / Moderate shaking (MMI V) : Slow Side to side motion, swinging chandeliers and sloshing pool water  
Northridge, Los Angeles, California (187.5 km SSW of epicenter) [Map] / Light shaking (MMI IV)
Lancaster California / Strong shaking (MMI VI) : It felt like it began rolling then it jolted....it lasted about 45 seconds...  
Palmdale, laying on my couch on 2nd floor / Strong shaking (MMI VI) : My cat ran and hid, a lamp fell off a shelf. The rocking felt like it lasted a long time. I was laying down so I was looking up at the ceiling and around to make sure nothing would fall on me.  
Shafter / Light shaking (MMI IV)
Las Vegas, NV (203.5 km ENE of epicenter) [Map] / Weak shaking (MMI III) : Longer and stronger than yesterday’s quake  
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