Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 12-04-2021 and time 06:58:19 (UTC) in region 2 km SW Alfedena (AQ)

A magnitude ML 1.4 earthquake occured in region: 2 km SW Alfedena (AQ), on

  • 12-04-2021 06:58:19 (UTC)
  • 12-04-2021 08:58:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7220, 14.0170 at 18 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
Alfedena AQ 2 864 864
Scontrone AQ 3 574 1438
Montenero Val Cocchiara IS 4 538 1976
Barrea AQ 5 726 2702
Pizzone IS 6 329 3031
Civitella Alfedena AQ 8 296 3327
Castel San Vincenzo IS 8 516 3843
Villetta Barrea AQ 10 653 4496
Rionero Sannitico IS 10 1118 5614
Cerro al Volturno IS 10 1281 6895
Castel di Sangro AQ 11 6538 13433
Scapoli IS 12 680 14113
Rocchetta a Volturno IS 12 1113 15226
Acquaviva d'Isernia IS 12 425 15651
San Biagio Saracinisco FR 14 349 16000
Forlì del Sannio IS 14 675 16675
Roccaraso AQ 15 1627 18302
Picinisco FR 15 1218 19520
Settefrati FR 15 728 20248
Colli a Volturno IS 15 1349 21597
San Pietro Avellana IS 16 503 22100
Fornelli IS 17 1909 24009
Opi AQ 17 420 24429
San Donato Val di Comino FR 17 2107 26536
Rivisondoli AQ 17 700 27236
Roccasicura IS 18 550 27786
Villa Latina FR 19 1241 29027
Pescocostanzo AQ 19 1128 30155
Montaquila IS 19 2456 32611
Gallinaro FR 19 1269 33880
Filignano IS 20 648 34528

Municipalities with at least 50000 inhabitants

An earthquake occurred to
71 Km S of Chieti (51815 inhabitants)
77 Km NW of Caserta (76326 inhabitants)
84 Km S of Pescara (121014 inhabitants)
85 Km N of Aversa (53047 inhabitants)
87 Km SE of L'Aquila (69753 inhabitants)
89 Km S of Montesilvano (53738 inhabitants)
90 Km N of Giugliano in Campania (122974 inhabitants)
91 Km NW of Acerra (59573 inhabitants)
92 Km NW of Benevento (60091 inhabitants)
92 Km N of Afragola (65057 inhabitants)
93 Km N of Marano di Napoli (59874 inhabitants)
94 Km N of Casoria (77642 inhabitants)
97 Km E of Latina (125985 inhabitants)
97 Km N of Pozzuoli (81661 inhabitants)
100 Km N of Napoli (974074 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 2021-04-12
06:58:19		 41.7223 14.0167 18 2021-07-12
16:55:08		 Bollettino Sismico Italiano INGV 89394831
Reviewed
Rev100 		ML 1.5 2021-04-12
06:58:19		 41.7197 14.0112 20 2021-04-12
07:15:52		 Sala Sismica INGV-Roma 89032961
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-12 06:58:19 ± 0.14
Latitude 41.7223 ± 0.0054
Longitude 14.0167 ± 0.0060
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89394831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 659
Semi-minor axis of confidence ellipse (meter) 146
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 196
Circular confidence region, given by single value of horizontal uncertainty (meter) 660.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 117
Number of associated phases, regardless of their use for origin computation 16
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.25
Epicentral distance of station closest to the epicenter (degree) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.33005
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
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 89394831
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-23 11:03:20

ML:1.5

Field Value
Value 1.5
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 89032961
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-12 07:15:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.LRP.EHZ. 2021-04-12T06:58:32.17 0.3 undecidable manual S 257 36.6411 105 0.27 68
IV.INTR.HHZ. 2021-04-12T06:58:31.11 0.6 undecidable manual S 344 33.4443 107 0.03 48
IV.VVLD.HHZ. 2021-04-12T06:58:31.77 0.6 undecidable manual S 297 36.4413 105 -0.09 48
IV.POFI.HNZ. 2021-04-12T06:58:29.04 0.6 undecidable manual S 269 25.2525 115 -0.01 49
IV.MIDA.HHZ. 2021-04-12T06:58:27.72 0.3 undecidable manual S 114 21.5673 120 -0.46 66
IV.CERA.HHZ. 2021-04-12T06:58:26.46 0.1 undecidable manual S 179 13.7751 135 -0.06 99
IV.LRP.EHZ. 2021-04-12T06:58:26.64 0.1 undecidable manual P 257 36.6411 105 0.01 96
IV.RNI2.HHZ. 2021-04-12T06:58:26.87 0.6 undecidable manual S 101 11.4774 141 0.77 41
IT.OPI.HGZ. 2021-04-12T06:58:26.73 0.3 undecidable manual S 291 16.5723 129 -0.34 71
IV.INTR.HHZ. 2021-04-12T06:58:26.12 0.1 undecidable manual P 344 33.4443 107 -0.04 96
IV.VVLD.HHZ. 2021-04-12T06:58:26.40 0.1 undecidable manual P 297 36.4413 105 -0.21 92
IV.POFI.HNZ. 2021-04-12T06:58:25.14 0.3 undecidable manual P 269 25.2525 115 0.16 71
IV.MIDA.HHZ. 2021-04-12T06:58:24.36 0.1 undecidable manual P 114 21.5673 120 -0.13 95
IV.CERA.HHZ. 2021-04-12T06:58:23.55 0.1 undecidable manual P 179 13.7751 135 0.02 100
IV.RNI2.HHZ. 2021-04-12T06:58:23.68 0.1 undecidable manual P 101 11.4774 141 0.4 93
IT.OPI.HGZ. 2021-04-12T06:58:23.80 0.1 undecidable manual P 291 16.5723 129 -0.04 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RNI2.HNN. ML:1.7 0.00036899999999999997 0.2 AML other m 2021-04-12T06:58:27.07
IV.RNI2.HHN. ML:1.7 0.0003635 0.2 AML other m 2021-04-12T06:58:27.07
IV.RNI2.HHE. ML:1.8 0.0005105 0.16 AML other m 2021-04-12T06:58:27.32
IV.RNI2.HNE. ML:1.8 0.0004855 0.18 AML other m 2021-04-12T06:58:27.32
IV.CERA.HHE. ML:1.3 0.0001385 0.64 AML other m 2021-04-12T06:58:27.56
IV.MIDA.HHN. ML:1.2 0.000087 1.26 AML other m 2021-04-12T06:58:28.19
IV.CERA.HHN. ML:1.2 0.0001129 0.7 AML other m 2021-04-12T06:58:28.66
IV.MIDA.HHE. ML:1.2 0.00009745000000000001 0.66 AML other m 2021-04-12T06:58:29.48
IV.INTR.HHN. ML:1.5 0.00011115 0.2 AML other m 2021-04-12T06:58:31.69
IV.INTR.HHE. ML:1.4 0.0000995 1.38 AML other m 2021-04-12T06:58:31.23
IV.LRP.EHN. ML:1.3 0.00006470000000000001 0.28 AML other m 2021-04-12T06:58:32.36
IV.LRP.EHE. ML:1.4 0.00008685000000000001 0.26 AML other m 2021-04-12T06:58:32.40
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