INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of mb 4.3 on date 04-08-2018 and time 01:28:50 (Italy) in region Libya [Sea]

A magnitude mb 4.3 earthquake occured in region: Libya [Sea], on

  • 03-08-2018 23:28:50 (UTC)
  • 04-08-2018 01:28:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 34.4, 13.61 at 69 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

No Italian municipalities within 100 km from the epicenter with at least 50000 inhabitants.

Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 mb 4.3
Mwp 4.6
2018-08-03
23:28:50
34.4 13.61 69 2018-08-04
05:01:50
Sala Sismica INGV-Roma 59336771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-03 23:28:50
Latitude 34.40
Longitude 13.61
Depth (km) 69 (from location)
Evaluation mode of Origin automatic
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV-A
Event type earthquake
Origin ID 59336771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 7002
Semi-minor axis of confidence ellipse (meter) 718
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 330
Circular confidence region, given by single value of horizontal uncertainty (meter) 5660
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170.304
Number of associated phases, regardless of their use for origin computation 12
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.785333
Epicentral distance of station closest to the epicenter (degree) 1.6198
Epicentral distance of station farthest from the epicenter (degree) 45.59369
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitudes information

Mwp:4.6

Field Value
Value 4.6
Uncertainty 0
Num. used stations 1
Type of magnitude Mwp
Reference to an origin 59336771
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-08-04 05:01:50

mb:4.3

Field Value
Value 4.3
Uncertainty 0.2
Num. used stations 6
Type of magnitude mb
Reference to an origin 59336771
Agency INGV
Autore Auto added
Time of creation (UTC) 2018-08-04 05:01:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
DK.NRS.BHZ. 2018-08-03T23:37:01.90 10.0 negative automatic P 325 45.5937 -0.673685 0.600348
HT.LIT.HHZ. 2018-08-03T23:30:58.17 10.0 negative automatic P 48 9.0721 0.571894 0.980392
HT.FNA.HHZ. 2018-08-03T23:30:55.40 10.0 positive automatic P 42 8.8615 0.630802 0.97561
HL.ITM.HHZ. 2018-08-03T23:30:33.85 10.0 negative automatic P 65 7.2912 0.596844 0.985222
HL.KEK.HHZ. 2018-08-03T23:30:31.64 10.0 positive automatic P 41 7.248 -0.987742 0.985222
MN.VSL.BHZ. 2018-08-03T23:30:17.92 10.0 positive automatic P 328 6.1137 0.779414 0.952381
MN.CUC.BHZ. 2018-08-03T23:30:13.92 10.0 positive automatic P 17 5.862 0.173126 0.97561
MN.TIP.BHZ. 2018-08-03T23:30:07.37 10.0 positive automatic P 27 5.4022 -0.112895 0.952381
MN.CEL.BHZ. 2018-08-03T23:29:52.17 10.0 negative automatic P 25 4.2755 0.0995258 0.909091
MN.CLTB.BHZ. 2018-08-03T23:29:37.45 10.0 positive automatic P 354 3.1934 0.102014 0.952381
TT.TATN.BHZ.00 2018-08-03T23:29:36.57 10.0 positive automatic P 236 3.1491 -0.104635 0.930233
MN.WDD.BHZ. 2018-08-03T23:29:14.52 10.0 positive automatic P 27 1.6198 -1.37655 0.930233
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download