Earthquake with magnitude of ML 0.4 on date 20-08-2018 and time 21:22:58 (Italy) in region 4 km NE Guardialfiera (CB)

A magnitude ML 0.4 earthquake occured in region: 4 km NE Guardialfiera (CB), on

  • 20-08-2018 19:22:58 (UTC)
  • 20-08-2018 21:22:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.84, 14.81 at 17 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Guardialfiera CB 4 1065 1065
Palata CB 6 1726 2791
Acquaviva Collecroce CB 6 672 3463
Montecilfone CB 7 1348 4811
Castelmauro CB 8 1505 6316
Tavenna CB 9 718 7034
Larino CB 9 6793 13827
Lupara CB 11 505 14332
San Felice del Molise CB 11 634 14966
Casacalenda CB 11 2135 17101
Guglionesi CB 12 5321 22422
Civitacampomarano CB 12 417 22839
Castelbottaccio CB 13 312 23151
Montorio nei Frentani CB 13 437 23588
Provvidenti CB 13 119 23707
Montenero di Bisaccia CB 14 6675 30382
Mafalda CB 14 1211 31593
Morrone del Sannio CB 14 587 32180
Montefalcone nel Sannio CB 15 1556 33736
Montemitro CB 15 395 34131
Lucito CB 16 696 34827
Montelongo CB 16 365 35192
Castellino del Biferno CB 17 545 35737
Ripabottoni CB 17 514 36251
Ururi CB 17 2693 38944
San Martino in Pensilis CB 17 4793 43737
Roccavivara CB 18 815 44552
Tufillo CH 18 406 44958
San Giacomo degli Schiavoni CB 18 1406 46364
Bonefro CB 18 1384 47748
Dogliola CH 19 359 48107
Portocannone CB 19 2551 50658
Rotello CB 19 1212 51870
Petrella Tifernina CB 19 1170 53040
Celenza sul Trigno CH 20 915 53955
Fresagrandinaria CH 20 961 54916
Petacciato CB 20 3819 58735

Municipalities with at least 50000 inhabitants

An earthquake occurred to
50 Km W of San Severo (53905 inhabitants)
74 Km NW of Foggia (151991 inhabitants)
78 Km SE of Chieti (51815 inhabitants)
79 Km N of Benevento (60091 inhabitants)
85 Km SE of Pescara (121014 inhabitants)
93 Km SE of Montesilvano (53738 inhabitants)
94 Km NE of Caserta (76326 inhabitants)
95 Km W of Manfredonia (57279 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 1000 ML 0.4 2018-08-20
19:22:58
41.84 14.81 17 2019-04-24
14:51:18
Bollettino Sismico Italiano INGV 67218551
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-20 19:22:58 ± 0.23
Latitude 41.84 ± 0.01
Longitude 14.81 ± 0.01
Depth (km) 17 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 67218551

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 850
Semi-minor axis of confidence ellipse (meter) 535
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 221
Circular confidence region, given by single value of horizontal uncertainty (meter) 850
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.06475
Epicentral distance of station farthest from the epicenter (degree) 0.2698
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0
Num. used stations 1
Type of magnitude ML
Reference to an origin 67218551
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-04-03 10:52:15
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MELA.HHZ. 2018-08-20T19:23:09.15 0.6 undecidable manual S 119 0.2698 108 0.03 48
IV.FRES.HHZ. 2018-08-20T19:23:06.02 0.6 undecidable manual S 322 0.1718 121 -0.44 45
YD.T1413.EHZ. 2018-08-20T19:23:06.15 0.3 undecidable manual S 85 0.1529 125 0.15 72
YD.T1411.EHZ. 2018-08-20T19:23:05.66 0.3 undecidable manual S 38 0.1358 129 0.05 73
YD.T1412.EHZ. 2018-08-20T19:23:04.28 0.3 undecidable manual S 211 0.0648 152 0.03 75
IV.MELA.HHZ. 2018-08-20T19:23:04.48 0.3 undecidable manual P 119 0.2698 108 -0.13 70
IV.FRES.HHZ. 2018-08-20T19:23:03.55 0.3 undecidable manual P 322 0.1718 121 0.48 67
YD.T1411.EHZ. 2018-08-20T19:23:02.48 0.1 undecidable manual P 38 0.1358 129 -0.1 97
YD.T1413.EHZ. 2018-08-20T19:23:02.69 0.1 undecidable manual P 85 0.1529 125 -0.12 96
YD.T1412.EHZ. 2018-08-20T19:23:01.78 0.1 positive manual P 211 0.0648 152 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.T1412.EHE. ML:0 6.47596835E-5 0.2944 AML other m 2018-08-20T19:23:04.15
IV.T1411.EHN. ML:0 0.00013821208 0.1408 AML other m 2018-08-20T19:23:05.73
IV.T1411.EHE. ML:0 0.00010494545 0.2432 AML other m 2018-08-20T19:23:05.98
IV.T1411.HNN. ML:0 0.00015456445 0.6272 AML other m 2018-08-20T19:23:05.42
IV.FRES.HHN. ML:0.4 1.2520704E-5 0.0768 AML other m 2018-08-20T19:23:04.19
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