Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 01-08-2021 and time 07:27:45 (Italy) in region 6 km SW Barrea (AQ)

A magnitude ML 0.9 earthquake occured in region: 6 km SW Barrea (AQ), on

  • 01-08-2021 05:27:45 (UTC)
  • 01-08-2021 07:27:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7080, 13.9520 at 11 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
Barrea AQ 7 726 726
Civitella Alfedena AQ 7 296 1022
Alfedena AQ 8 864 1886
Villetta Barrea AQ 8 653 2539
Pizzone IS 8 329 2868
Scontrone AQ 8 574 3442
Settefrati FR 9 728 4170
Montenero Val Cocchiara IS 10 538 4708
Picinisco FR 10 1218 5926
San Biagio Saracinisco FR 11 349 6275
Castel San Vincenzo IS 11 516 6791
San Donato Val di Comino FR 11 2107 8898
Opi AQ 13 420 9318
Scapoli IS 14 680 9998
Gallinaro FR 14 1269 11267
Cerro al Volturno IS 14 1281 12548
Villa Latina FR 14 1241 13789
Rocchetta a Volturno IS 15 1113 14902
Castel di Sangro AQ 16 6538 21440
Rionero Sannitico IS 16 1118 22558
Atina FR 16 4316 26874
Acquaviva d'Isernia IS 17 425 27299
Colli a Volturno IS 18 1349 28648
Alvito FR 18 2713 31361
Pescasseroli AQ 18 2203 33564
Vallerotonda FR 18 1581 35145
Acquafondata FR 18 263 35408
Belmonte Castello FR 19 739 36147
Roccaraso AQ 19 1627 37774
Forlì del Sannio IS 19 675 38449
Fornelli IS 19 1909 40358
Sant'Elia Fiumerapido FR 20 6166 46524
Filignano IS 20 648 47172

Municipalities with at least 50000 inhabitants

An earthquake occurred to
74 Km S of Chieti (51815 inhabitants)
77 Km NW of Caserta (76326 inhabitants)
84 Km N of Aversa (53047 inhabitants)
85 Km SE of L'Aquila (69753 inhabitants)
87 Km S of Pescara (121014 inhabitants)
89 Km N of Giugliano in Campania (122974 inhabitants)
91 Km E of Latina (125985 inhabitants)
91 Km S of Montesilvano (53738 inhabitants)
92 Km NW of Acerra (59573 inhabitants)
92 Km N of Marano di Napoli (59874 inhabitants)
92 Km NW of Afragola (65057 inhabitants)
94 Km NW of Casoria (77642 inhabitants)
94 Km NW of Benevento (60091 inhabitants)
96 Km N of Pozzuoli (81661 inhabitants)
98 Km E of Velletri (53303 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 0.9 2021-08-01
05:27:45		 41.7085 13.9523 11 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97381681
Reviewed
Rev100 		ML 1.1 2021-08-01
05:27:44		 41.6605 13.9268 24 2021-08-01
05:37:21		 Sala Sismica INGV-Roma 93477331
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-01 05:27:45 ± 0.13
Latitude 41.7085 ± 0.0117
Longitude 13.9523 ± 0.0120
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97381681

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1400
Semi-minor axis of confidence ellipse (meter) 662
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
Circular confidence region, given by single value of horizontal uncertainty (meter) 1400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 101
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.32
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.30487
Number of stations at which the event was observed 25
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 4
Type of magnitude ML
Reference to an origin 93477331
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-01 05:37:21

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 97381681
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-10 15:36:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.RSP.HHZ. 2021-08-01T05:29:30.12 3.0 undecidable manual Pg 16.98 0
SI.ABSI.HHZ. 2021-08-01T05:29:22.52 3.0 positive manual Pg 16.5 0
IV.ZONE.HHZ. 2021-08-01T05:29:11.33 3.0 positive manual Pg 11.88 0
IV.VOBA.EHZ. 2021-08-01T05:28:59.25 3.0 negative manual Pn 3.22 0
IV.HMDC.HHZ. 2021-08-01T05:28:58.40 3.0 positive manual Pn 3.83 0
IV.NOCI.HHZ. 2021-08-01T05:28:57.07 3.0 undecidable manual Sn -1.48 0
GU.GORR.HHZ. 2021-08-01T05:28:54.34 3.0 undecidable manual Pn 1.47 0
IV.SSY.HHZ. 2021-08-01T05:28:52.38 3.0 undecidable manual Pn -0.08 0
GU.GSCL.HHZ. 2021-08-01T05:28:52.17 3.0 undecidable manual Pg 10.88 0
IV.MMUR.HNZ. 2021-08-01T05:28:47.18 3.0 undecidable manual Sg 2.21 0
TV.SF01.EHZ. 2021-08-01T05:28:44.76 3.0 undecidable manual Sn -3.29 0
IV.SGO.HHZ. 2021-08-01T05:28:33.36 3.0 undecidable manual S 0.71 0
IV.SPS2.HHZ. 2021-08-01T05:28:31.45 3.0 positive manual Pn 0.13 0
IV.FIR.HHZ. 2021-08-01T05:28:31.58 3.0 undecidable manual Pn 0.59 0
IV.TDS.HHZ. 2021-08-01T05:28:26.54 3.0 undecidable manual Pn -0.99 0
IV.CPGN.EHZ. 2021-08-01T05:28:24.00 3.0 undecidable manual Pn -1.25 0
IV.GAVE.EHZ. 2021-08-01T05:28:24.77 3.0 undecidable manual S -4.39 0
IV.MMUR.HNZ. 2021-08-01T05:28:18.74 3.0 undecidable manual Pn 0.68 0
IV.VVLD.HHZ. 2021-08-01T05:27:56.76 0.6 undecidable manual S 303 32.5452 50 0.5 49
IV.POFI.HHE. 2021-08-01T05:27:53.21 0.3 undecidable manual S 273 19.9689 50 0.33 79
IV.CERA.HNE. 2021-08-01T05:27:51.16 0.6 undecidable manual S 156 13.4754 129 0.12 54
IV.INTR.HHE. 2021-08-01T05:27:51.34 0.3 undecidable manual P 353 33.8439 50 -0.38 75
IV.VVLD.HHZ. 2021-08-01T05:27:51.65 0.3 undecidable manual P 303 32.5452 50 0.13 80
IT.OPI.HGN. 2021-08-01T05:27:50.52 0.6 undecidable manual S 307 12.5763 131 -0.29 53
IV.LRP.EHZ. 2021-08-01T05:27:50.68 0.3 undecidable manual P 257 31.0467 50 -0.61 70
IV.MIDA.HHZ. 2021-08-01T05:27:50.21 0.3 undecidable manual P 106 26.0517 50 -0.31 78
IV.RNI2.HHZ. 2021-08-01T05:27:49.49 0.1 undecidable manual P 92 16.5723 123 0.48 100
IV.POFI.HHE. 2021-08-01T05:27:49.68 0.3 undecidable manual P 273 19.9689 50 0.11 82
IV.CERA.HNE. 2021-08-01T05:27:48.38 0.3 undecidable manual P 156 13.4754 129 -0.12 83
IT.OPI.HGN. 2021-08-01T05:27:48.34 0.3 undecidable manual P 307 12.5763 131 -0.04 83
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RNI2.HHN. ML:1.2 0.0001455 0.5 AML other m 2021-08-01T05:27:54.90
IV.RNI2.HHE. ML:0.9 0.00006955 1.08 AML other m 2021-08-01T05:27:56.25
IV.VVLD.HHE. ML:0.8 0.00002535 0.68 AML other m 2021-08-01T05:27:58.65
IV.VVLD.HHN. ML:0.8 0.000031299999999999995 0.7 AML other m 2021-08-01T05:27:58.59
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