Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 30-07-2021 and time 10:29:29 (Italy) in region 3 km E Opi (AQ)

A magnitude ML 1.6 earthquake occured in region: 3 km E Opi (AQ), on

  • 30-07-2021 08:29:29 (UTC)
  • 30-07-2021 10:29:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7740, 13.8670 at 21 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
Opi AQ 3 420 420
Villetta Barrea AQ 5 653 1073
Civitella Alfedena AQ 6 296 1369
Pescasseroli AQ 8 2203 3572
San Donato Val di Comino FR 8 2107 5679
Barrea AQ 11 726 6405
Settefrati FR 12 728 7133
Gallinaro FR 14 1269 8402
Alvito FR 14 2713 11115
Picinisco FR 14 1218 12333
Scanno AQ 15 1847 14180
Alfedena AQ 15 864 15044
Scontrone AQ 15 574 15618
Campoli Appennino FR 16 1725 17343
Posta Fibreno FR 17 1139 18482
Vicalvi FR 17 783 19265
Pescosolido FR 18 1555 20820
Montenero Val Cocchiara IS 18 538 21358
Villa Latina FR 18 1241 22599
Atina FR 18 4316 26915
Villalago AQ 18 568 27483
San Biagio Saracinisco FR 18 349 27832
Pizzone IS 18 329 28161
Bisegna AQ 19 223 28384
Roccaraso AQ 19 1627 30011
Fontechiari FR 19 1303 31314
Rivisondoli AQ 20 700 32014

Municipalities with at least 50000 inhabitants

An earthquake occurred to
69 Km SW of Chieti (51815 inhabitants)
75 Km SE of L'Aquila (69753 inhabitants)
82 Km SW of Pescara (121014 inhabitants)
86 Km S of Montesilvano (53738 inhabitants)
87 Km NW of Caserta (76326 inhabitants)
87 Km E of Latina (125985 inhabitants)
91 Km E of Tivoli (56533 inhabitants)
91 Km E of Velletri (53303 inhabitants)
93 Km NW of Aversa (53047 inhabitants)
98 Km E of Guidonia Montecelio (88673 inhabitants)
98 Km N of Giugliano in Campania (122974 inhabitants)
99 Km S of Teramo (54892 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 1.6 2021-07-30
08:29:29		 41.7737 13.8668 21 2021-12-29
11:12:51		 Bollettino Sismico Italiano INGV 97332241
Reviewed
Rev100 		ML 1.6 2021-07-30
08:29:29		 41.7802 13.8627 21 2021-07-30
08:37:17		 Sala Sismica INGV-Roma 93392741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-30 08:29:29 ± 0.14
Latitude 41.7737 ± 0.0045
Longitude 13.8668 ± 0.0072
Depth (km) 21 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 97332241

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 620
Semi-minor axis of confidence ellipse (meter) 121
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 58
Circular confidence region, given by single value of horizontal uncertainty (meter) 620.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.46045
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 93392741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-30 08:37:17

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 14
Type of magnitude ML
Reference to an origin 97332241
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-12-05 16:45:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SCHR.EHZ. 2021-07-30T08:30:42.54 3.0 undecidable manual Sg 16.58 0
CR.ZAG.BHZ. 2021-07-30T08:30:29.66 3.0 undecidable manual Sg 12.19 0
AC.VLO.HHZ. 2021-07-30T08:30:21.01 3.0 positive manual Pg 15.86 0
GU.ENR.HHZ. 2021-07-30T08:30:07.88 3.0 undecidable manual Pg 15 0
IV.CELI.HHZ. 2021-07-30T08:30:06.15 3.0 undecidable manual Pg 13.02 0
GU.STV.HHZ. 2021-07-30T08:30:05.85 3.0 undecidable manual Pg 12.03 0
NI.POLC.HHZ. 2021-07-30T08:30:04.03 3.0 undecidable manual Sn -5.21 0
IV.ECTS.HHZ. 2021-07-30T08:30:03.09 3.0 positive manual Pn -3.75 0
IV.BDI.HHZ. 2021-07-30T08:29:57.26 3.0 undecidable manual Sg 5.75 0
IV.NDIM.HNZ. 2021-07-30T08:29:56.36 3.0 undecidable manual Sn -1.81 0
IV.GIZZ.HHZ. 2021-07-30T08:29:56.98 3.0 undecidable manual Pn 0.32 0
IV.T0110.HHZ. 2021-07-30T08:29:46.28 0.1 undecidable manual S 352 51.1155 104 0.52 83
IV.CMPO.HNZ. 2021-07-30T08:29:43.22 3.0 undecidable manual Sg 1.32 0
IV.LPEL.HNN. 2021-07-30T08:29:42.30 0.6 undecidable manual S 41 40.0266 109 -0.62 40
IV.MCI.EHE. 2021-07-30T08:29:41.52 0.6 undecidable manual S 188 31.6461 115 0.66 40
IV.MIDA.HHZ. 2021-07-30T08:29:41.60 0.3 undecidable manual S 114 35.2425 112 -0.14 69
IV.VAGA.HHZ. 2021-07-30T08:29:39.17 0.6 undecidable manual P 142 50.1165 105 0.5 42
IV.RNI2.HHZ. 2021-07-30T08:29:39.80 0.1 undecidable manual S 108 24.8529 122 0.52 86
IV.INTR.HNE. 2021-07-30T08:29:39.40 0.3 undecidable manual S 7 26.5512 120 -0.25 68
IV.T0110.HHZ. 2021-07-30T08:29:39.00 0.1 undecidable manual P 352 51.1155 104 0.18 89
IV.LRP.EHZ. 2021-07-30T08:29:39.30 0.3 undecidable manual S 239 27.1506 120 -0.48 66
IV.CERA.HHZ. 2021-07-30T08:29:38.70 0.3 undecidable manual S 147 23.1546 125 -0.2 70
IV.PTQR.HHZ. 2021-07-30T08:29:38.38 0.3 undecidable manual P 306 47.3193 106 0.12 68
IV.VVLD.HNE. 2021-07-30T08:29:38.70 0.3 undecidable manual S 298 22.755 125 -0.1 71
IV.VIVA.HHZ. 2021-07-30T08:29:37.14 3.0 undecidable manual S 2.91 0
IV.POFI.HHZ. 2021-07-30T08:29:37.20 0.3 undecidable manual S 244 14.2746 141 0.07 72
IV.LPEL.HNN. 2021-07-30T08:29:36.85 0.1 positive manual P 41 40.0266 109 -0.33 88
IV.MIDA.HHZ. 2021-07-30T08:29:36.14 0.1 negative manual P 114 35.2425 112 -0.35 88
IV.LRP.EHZ. 2021-07-30T08:29:35.56 0.1 positive manual P 239 27.1506 120 0.19 92
IT.OPI.HGZ. 2021-07-30T08:29:35.60 0.1 undecidable manual S 275 2.997 171 -0.27 95
IV.RNI2.HHZ. 2021-07-30T08:29:35.48 0.1 positive manual P 108 24.8529 122 0.41 89
IV.MCI.EHE. 2021-07-30T08:29:35.92 0.6 undecidable manual P 188 31.6461 115 -0.07 47
IV.INTR.HNE. 2021-07-30T08:29:35.16 0.1 negative manual P 7 26.5512 120 -0.13 94
IV.CERA.HHZ. 2021-07-30T08:29:34.66 0.1 negative manual P 147 23.1546 125 -0.2 93
IV.VVLD.HNE. 2021-07-30T08:29:34.83 0.1 positive manual P 298 22.755 125 0.03 96
IV.POFI.HHZ. 2021-07-30T08:29:33.94 0.1 positive manual P 244 14.2746 141 0.1 96
IT.OPI.HGZ. 2021-07-30T08:29:33.08 0.1 undecidable manual P 275 2.997 171 -0.03 100
IV.OPPE.HHZ. 2021-07-30T08:29:31.79 3.0 undecidable manual Pg 3.42 0
GU.GSCL.HHZ. 2021-07-30T08:29:25.96 3.0 undecidable manual Pg 2.04 0
IV.SFI.EHZ. 2021-07-30T08:29:22.68 3.0 undecidable manual S -7.47 0
IV.RIBO.EHZ.01 2021-07-30T08:29:18.37 3.0 undecidable manual Pg 2.95 0
IV.VIVA.HHZ. 2021-07-30T08:29:08.51 3.0 positive manual P -3.88 0
IV.CRE.HHZ. 2021-07-30T08:29:04.14 3.0 negative manual P -3.13 0
IV.TERO.HHZ. 2021-07-30T08:29:00.44 3.0 undecidable manual P 3.2 0
IV.SENI.HNZ. 2021-07-30T08:28:54.27 3.0 negative manual P -2.13 0
IV.FOSV.EHZ. 2021-07-30T08:28:52.88 3.0 undecidable manual P -1.52 0
IV.MMUR.HNZ. 2021-07-30T08:28:50.55 3.0 undecidable manual P -2.18 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.POFI.HHN. ML:1.6 0.00028100000000000005 0.74 AML other m 2021-07-30T08:29:38.17
IV.POFI.HHE. ML:1.6 0.000263 0.24 AML other m 2021-07-30T08:29:39.42
IV.CERA.HHE. ML:1.4 0.0001105 1.52 AML other m 2021-07-30T08:29:40.11
IV.CERA.HHN. ML:1.7 0.000251 0.34 AML other m 2021-07-30T08:29:40.22
IV.RNI2.HHN. ML:2.1 0.0006739999999999999 0.64 AML other m 2021-07-30T08:29:40.60
IV.RNI2.HHE. ML:1.8 0.000325 0.3 AML other m 2021-07-30T08:29:40.80
IV.LRP.EHN. ML:1.2 0.0000771 1.78 AML other m 2021-07-30T08:29:41.01
IV.MIDA.HHE. ML:1.7 0.0001615 0.16 AML other m 2021-07-30T08:29:41.94
IV.LRP.EHE. ML:1.7 0.000211 0.26 AML other m 2021-07-30T08:29:42.06
IV.MIDA.HHN. ML:1.8 0.00022700000000000002 0.78 AML other m 2021-07-30T08:29:42.52
IV.TST01.HHE. ML:1.2 0.0000407 1.44 AML other m 2021-07-30T08:29:46.27
IV.VAGA.HHE. ML:1.1 0.0000293 0.72 AML other m 2021-07-30T08:29:50.04
IV.VAGA.HHN. ML:1.5 0.00007285 0.22 AML other m 2021-07-30T08:29:50.39
IV.TST01.HHN. ML:1.2 0.0000468 0.94 AML other m 2021-07-30T08:29:58.84
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