Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-08-2021 and time 08:09:10 (Italy) in region 4 km SW Vastogirardi (IS)

A magnitude ML 1.4 earthquake occured in region: 4 km SW Vastogirardi (IS), on

  • 04-08-2021 06:09:10 (UTC)
  • 04-08-2021 08:09:10 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7460, 14.2340 at 20 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Vastogirardi IS 4 704 704
Roccasicura IS 5 550 1254
Carovilli IS 6 1359 2613
San Pietro Avellana IS 6 503 3116
Forlì del Sannio IS 7 675 3791
Rionero Sannitico IS 9 1118 4909
Capracotta IS 10 903 5812
Acquaviva d'Isernia IS 11 425 6237
Castel di Sangro AQ 11 6538 12775
Miranda IS 11 1047 13822
Pescolanciano IS 11 855 14677
Castel del Giudice IS 12 346 15023
Ateleta AQ 13 1181 16204
Pietrabbondante IS 13 759 16963
Agnone IS 13 5139 22102
Castelverrino IS 14 115 22217
Montenero Val Cocchiara IS 14 538 22755
Sessano del Molise IS 15 727 23482
Chiauci IS 15 233 23715
Cerro al Volturno IS 15 1281 24996
Pesche IS 15 1661 26657
Poggio Sannita IS 15 702 27359
Sant'Angelo del Pesco IS 16 364 27723
Pescopennataro IS 16 285 28008
Scontrone AQ 16 574 28582
Alfedena AQ 17 864 29446
Civitanova del Sannio IS 17 945 30391
Roccaraso AQ 17 1627 32018
Fornelli IS 17 1909 33927
Castel San Vincenzo IS 17 516 34443
Isernia IS 18 21842 56285
Gamberale CH 18 320 56605
Belmonte del Sannio IS 18 768 57373
Rocchetta a Volturno IS 18 1113 58486
Pizzone IS 19 329 58815
Carpinone IS 19 1157 59972
Bagnoli del Trigno IS 19 735 60707
Pettoranello del Molise IS 19 460 61167
Colli a Volturno IS 20 1349 62516
Rivisondoli AQ 20 700 63216
Pizzoferrato CH 20 1130 64346
Rosello CH 20 237 64583

Municipalities with at least 50000 inhabitants

An earthquake occurred to
68 Km S of Chieti (51815 inhabitants)
75 Km N of Caserta (76326 inhabitants)
80 Km S of Pescara (121014 inhabitants)
82 Km NW of Benevento (60091 inhabitants)
86 Km S of Montesilvano (53738 inhabitants)
86 Km N of Aversa (53047 inhabitants)
90 Km N of Acerra (59573 inhabitants)
91 Km N of Giugliano in Campania (122974 inhabitants)
92 Km N of Afragola (65057 inhabitants)
94 Km N of Casoria (77642 inhabitants)
94 Km N of Marano di Napoli (59874 inhabitants)
96 Km W of San Severo (53905 inhabitants)
96 Km SE of L'Aquila (69753 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
Bulletin
Rev1000 		ML 1.4 2021-08-04
06:09:10		 41.7462 14.2337 20 2021-12-29
11:12:41		 Bollettino Sismico Italiano INGV 97116971
Reviewed
Rev100 		ML 1.4 2021-08-04
06:09:10		 41.7493 14.2505 18 2021-08-04
06:19:06		 Sala Sismica INGV-Roma 93653351
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-04 06:09:10 ± 0.14
Latitude 41.7462 ± 0.0054
Longitude 14.2337 ± 0.0084
Depth (km) 20 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97116971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 640
Semi-minor axis of confidence ellipse (meter) 484
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 223
Circular confidence region, given by single value of horizontal uncertainty (meter) 640.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 32
Number of defining phases 18
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47124
Number of stations at which the event was observed 20
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 97116971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-31 20:23:16

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 93653351
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-04 06:19:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ECTS.HHZ. 2021-08-04T06:11:10.14 3.0 undecidable manual Sg 9.22 0
IV.FIR.HHZ. 2021-08-04T06:10:46.25 3.0 undecidable manual Sg 8.54 0
IV.IMOL.HNZ. 2021-08-04T06:10:46.88 3.0 undecidable manual Sg 4.26 0
IV.GIZZ.HHZ. 2021-08-04T06:10:43.80 3.0 undecidable manual Sg 1.66 0
IV.EUCT.HNZ. 2021-08-04T06:10:31.00 3.0 undecidable manual Pn 2.46 0
IV.MMGO.HHZ. 2021-08-04T06:10:27.10 3.0 undecidable manual Pg 10.44 0
IV.APEC.HHZ. 2021-08-04T06:10:20.13 3.0 undecidable manual Sg 0.37 0
SL.LJU.BHZ. 2021-08-04T06:10:11.67 3.0 undecidable manual Pn -6.38 0
IV.GIZZ.HHZ. 2021-08-04T06:10:07.18 3.0 negative manual Pg 4.76 0
IV.TOLF.HHZ. 2021-08-04T06:10:02.81 3.0 undecidable manual Sn -3.39 0
IV.APEC.HHZ. 2021-08-04T06:09:54.52 3.0 negative manual Pg 4.67 0
IV.IMTC.HHZ. 2021-08-04T06:09:47.35 3.0 undecidable manual S -3.04 0
IV.VVLD.HHZ. 2021-08-04T06:09:27.49 0.3 undecidable manual S 285 52.3032 102 0.06 47
IV.POFI.HNE. 2021-08-04T06:09:25.36 0.6 undecidable manual S 266 43.3233 106 0.26 45
IV.INTR.HHZ. 2021-08-04T06:09:24.51 0.6 undecidable manual S 317 40.0266 107 0.24 46
IV.VAGA.HHZ. 2021-08-04T06:09:23.83 0.6 undecidable manual S 180 36.6411 109 0.42 44
IV.LPEL.HHZ. 2021-08-04T06:09:22.73 0.6 undecidable manual S 353 33.6441 112 0.09 48
IV.TRIV.HHN. 2021-08-04T06:09:21.51 0.6 undecidable manual S 85 26.2515 119 0.64 41
IV.VVLD.HHZ. 2021-08-04T06:09:20.15 0.1 undecidable manual P 285 52.3032 102 -0.23 89
IV.CERA.HHZ. 2021-08-04T06:09:20.82 0.6 undecidable manual S 227 24.2535 121 0.42 45
IV.POFI.HNE. 2021-08-04T06:09:19.14 0.1 undecidable manual P 266 43.3233 106 0.11 93
IV.INTR.HHZ. 2021-08-04T06:09:18.56 0.1 undecidable manual P 317 40.0266 107 0 96
IV.TST01.HHZ. 2021-08-04T06:09:18.01 3.0 undecidable manual S 89 12.6762 142 -0.06 50
IV.MIDA.HHZ. 2021-08-04T06:09:17.18 0.6 undecidable manual S 172 11.6772 145 -0.73 42
IV.RNI2.HHZ. 2021-08-04T06:09:17.35 0.6 undecidable manual S 235 8.1807 154 -0.09 50
IV.LPEL.HHZ. 2021-08-04T06:09:17.62 0.3 undecidable manual P 353 33.6441 112 0 72
IV.VAGA.HHZ. 2021-08-04T06:09:17.99 0.3 undecidable manual P 180 36.6411 109 -0.07 72
IV.TRIV.HHN. 2021-08-04T06:09:16.67 0.3 undecidable manual P 85 26.2515 119 0.08 72
IV.CERA.HHZ. 2021-08-04T06:09:16.17 0.3 undecidable manual P 227 24.2535 121 -0.15 72
IV.TST01.HHZ. 2021-08-04T06:09:14.76 3.0 undecidable manual P 89 12.6762 142 -0.22 73
IV.MIDA.HHZ. 2021-08-04T06:09:14.60 0.1 positive manual P 172 11.6772 145 -0.29 95
IV.RNI2.HHZ. 2021-08-04T06:09:14.68 0.1 undecidable manual P 235 8.1807 154 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MIDA.HHE. ML:1.8 0.0004125 1.26 AML other m 2021-08-04T06:09:18.14
IV.MIDA.HHN. ML:1.8 0.0004935 0.38 AML other m 2021-08-04T06:09:18.33
IV.TST01.HHE. ML:1.2 0.000113 0.7 AML other m 2021-08-04T06:09:18.73
IV.TST01.HHN. ML:1.3 0.0001375 0.64 AML other m 2021-08-04T06:09:19.34
IV.LPEL.HHN. ML:1.3 0.00007089999999999999 1.26 AML other m 2021-08-04T06:09:23.96
IV.LPEL.HHE. ML:1.4 0.00008484999999999999 0.42 AML other m 2021-08-04T06:09:23.62
IV.VAGA.HHE. ML:0.9 0.000022850000000000003 1.2 AML other m 2021-08-04T06:09:25.15
IV.INTR.HHE. ML:1.4 0.00007865 0.54 AML other m 2021-08-04T06:09:25.45
IV.VAGA.HHN. ML:1.2 0.00006120000000000001 0.4 AML other m 2021-08-04T06:09:25.68
IV.INTR.HHN. ML:1.5 0.00010264999999999999 1.18 AML other m 2021-08-04T06:09:26.09
IV.VVLD.HHN. ML:1.4 0.000055650000000000004 0.18 AML other m 2021-08-04T06:09:27.68
IV.VVLD.HHE. ML:1.4 0.0000615 0.34 AML other m 2021-08-04T06:09:27.60
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download