Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 31-08-2017 and time 13:39:54 (Italy) in region 2 km E Opi (AQ)

A magnitude ML 2.1 earthquake occured in region: 2 km E Opi (AQ), on

  • 31-08-2017 11:39:54 (UTC)
  • 31-08-2017 13:39:54 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7790, 13.8600 at 10 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 2 420 420
Villetta Barrea AQ 6 653 1073
Pescasseroli AQ 7 2203 3276
Civitella Alfedena AQ 7 296 3572
San Donato Val di Comino FR 9 2107 5679
Barrea AQ 11 726 6405
Settefrati FR 12 728 7133
Scanno AQ 14 1847 8980
Alvito FR 14 2713 11693
Gallinaro FR 14 1269 12962
Picinisco FR 15 1218 14180
Scontrone AQ 15 574 14754
Alfedena AQ 15 864 15618
Campoli Appennino FR 16 1725 17343
Posta Fibreno FR 17 1139 18482
Vicalvi FR 17 783 19265
Pescosolido FR 17 1555 20820
Villalago AQ 18 568 21388
Bisegna AQ 18 223 21611
Atina FR 18 4316 25927
Villa Latina FR 18 1241 27168
Montenero Val Cocchiara IS 19 538 27706
San Biagio Saracinisco FR 19 349 28055
Pizzone IS 19 329 28384
Fontechiari FR 19 1303 29687
Roccaraso AQ 20 1627 31314
Rocca Pia AQ 20 178 31492
Rivisondoli AQ 20 700 32192

Municipalities with at least 50000 inhabitants

An earthquake occurred to
69 Km SW of Chieti (51815 inhabitants)
74 Km SE of L'Aquila (69753 inhabitants)
82 Km SW of Pescara (121014 inhabitants)
85 Km S of Montesilvano (53738 inhabitants)
87 Km E of Latina (125985 inhabitants)
88 Km NW of Caserta (76326 inhabitants)
90 Km E of Tivoli (56533 inhabitants)
90 Km E of Velletri (53303 inhabitants)
94 Km NW of Aversa (53047 inhabitants)
97 Km E of Guidonia Montecelio (88673 inhabitants)
99 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 2.1 2017-08-31
11:39:54		 41.7793 13.8603 10 2018-07-06
15:40:32		 Bollettino Sismico Italiano INGV 49692761
Reviewed
Rev100 		ML 2.1 2017-08-31
11:39:54		 41.7767 13.8592 11 2017-08-31
11:46:26		 Sala Sismica INGV-Roma 49540461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-08-31 11:39:54 ± 0.06
Latitude 41.7793 ± 0.0027
Longitude 13.8603 ± 0.0036
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 49692761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 246
Semi-minor axis of confidence ellipse (meter) 235
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 10
Circular confidence region, given by single value of horizontal uncertainty (meter) 260.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 50
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 37
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) 0.72845
Number of stations at which the event was observed 22
Number of stations from which data was used for origin computation 19
Magnitudes information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 44
Type of magnitude ML
Reference to an origin 49540461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-08-31 11:46:26

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 19
Type of magnitude ML
Reference to an origin 49692761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2017-09-04 12:07:39
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MURB.HHZ. 2017-08-31T11:40:28.43 3.0 negative manual Pg 4.63 0
IV.COLB.HHZ. 2017-08-31T11:40:23.22 3.0 undecidable manual S -4.43 0
IV.CESI.HHZ. 2017-08-31T11:40:21.29 3.0 undecidable manual P 2.52 0
IV.LATB.EHZ. 2017-08-31T11:40:18.59 0.6 undecidable manual S 247 80.8635 50 -0.11 45
IV.CERT.HHZ. 2017-08-31T11:40:17.11 0.3 undecidable manual S 285 74.9694 50 -0.01 69
IV.VCEL.EHZ. 2017-08-31T11:40:15.60 0.6 undecidable manual S 359 68.2761 50 0.28 44
IV.GIUL.HHZ. 2017-08-31T11:40:12.28 0.6 undecidable manual S 244 55.8996 50 0.26 45
IV.TRIV.HHZ. 2017-08-31T11:40:12.49 0.6 undecidable manual S 91 57.0984 50 0.14 46
IV.VAGA.HHZ. 2017-08-31T11:40:11.23 0.6 undecidable manual S 142 50.9157 50 0.54 42
IV.T0110.HHZ. 2017-08-31T11:40:10.80 0.3 undecidable manual S 352 50.4162 50 0.24 68
IV.PTQR.HHZ. 2017-08-31T11:40:10.05 0.3 undecidable manual S 305 46.5201 50 0.52 64
IV.GUAR.HHZ. 2017-08-31T11:40:08.77 0.6 undecidable manual S 272 45.3213 50 -0.44 45
IV.LPEL.HHZ. 2017-08-31T11:40:07.35 0.3 undecidable manual S 42 39.8268 50 -0.4 68
IV.LATB.EHZ. 2017-08-31T11:40:07.79 0.6 undecidable manual P 247 80.8635 50 -0.63 39
IV.CERT.HHZ. 2017-08-31T11:40:07.31 0.1 undecidable manual P 285 74.9694 50 -0.2 89
IV.MODR.HHZ. 2017-08-31T11:40:06.95 0.3 undecidable manual P 179 70.2741 50 0.16 67
IV.MCI.EHZ. 2017-08-31T11:40:06.17 0.6 undecidable manual S 187 32.2455 50 0.47 45
IV.MIDA.HHZ. 2017-08-31T11:40:06.52 0.3 undecidable manual S 115 36.0417 50 -0.19 72
IV.VCEL.EHZ. 2017-08-31T11:40:06.47 0.1 positive manual P 359 68.2761 50 -0.01 93
IV.GIUL.HHZ. 2017-08-31T11:40:04.56 0.1 undecidable manual P 244 55.8996 50 -0.01 95
IV.TRIV.HHZ. 2017-08-31T11:40:04.99 0.3 undecidable manual P 91 57.0984 50 0.23 68
IV.INTR.HHZ. 2017-08-31T11:40:04.24 0.3 undecidable manual S 8 26.0517 111 0.2 72
IV.LRP.EHZ. 2017-08-31T11:40:04.16 0.3 undecidable manual S 237 27.0507 50 -0.15 74
IV.RNI2.HHZ. 2017-08-31T11:40:04.35 0.6 undecidable manual S 109 25.5522 111 0.44 46
IV.CERA.HHZ. 2017-08-31T11:40:03.12 0.3 undecidable manual S 147 24.0537 112 -0.27 71
IV.T0110.HHZ. 2017-08-31T11:40:03.64 0.1 positive manual P 352 50.4162 50 -0.08 95
IV.VAGA.HHZ. 2017-08-31T11:40:03.80 0.1 undecidable manual P 142 50.9157 50 0 96
IV.PTQR.HHZ. 2017-08-31T11:40:02.96 0.1 undecidable manual P 305 46.5201 50 -0.17 94
IV.VVLD.HHZ. 2017-08-31T11:40:02.78 0.3 undecidable manual S 297 22.0668 114 0.03 76
IV.GUAR.HHZ. 2017-08-31T11:40:02.58 0.3 undecidable manual P 272 45.3213 50 -0.37 68
IV.LPEL.HHZ. 2017-08-31T11:40:01.82 0.3 undecidable manual P 42 39.8268 50 -0.28 70
IV.MIDA.HHZ. 2017-08-31T11:40:01.32 0.1 negative manual P 115 36.0417 50 -0.18 96
IV.LRP.EHZ. 2017-08-31T11:40:00.05 0.1 positive manual P 237 27.0507 50 -0.07 100
IV.RNI2.HHZ. 2017-08-31T11:40:00.26 0.3 undecidable manual P 109 25.5522 111 0.38 70
IV.MCI.EHZ. 2017-08-31T11:40:00.81 0.1 undecidable manual P 187 32.2455 50 -0.11 98
IV.POFI.HHZ. 2017-08-31T11:40:00.51 0.3 undecidable manual S 241 14.0748 125 0.16 76
IV.VVLD.HHZ. 2017-08-31T11:39:59.34 0.1 negative manual P 297 22.0668 114 0.12 100
IV.CERA.HHZ. 2017-08-31T11:39:59.43 0.1 positive manual P 147 24.0537 112 -0.16 97
IV.INTR.HHZ. 2017-08-31T11:39:59.86 0.1 positive manual P 8 26.0517 111 -0.1 99
IV.POFI.HHZ. 2017-08-31T11:39:58.17 0.1 negative manual P 241 14.0748 125 0.34 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CERA.HNE. ML:2.2 0.000964 0.28 AML other m 2017-08-31T11:40:03.40
IV.CERA.HHE. ML:2.2 0.0010090000000000001 0.28 AML other m 2017-08-31T11:40:03.40
IV.CERA.HNN. ML:2.4 0.0014399999999999999 0.38 AML other m 2017-08-31T11:40:03.71
IV.CERA.HHN. ML:2.4 0.00153 0.38 AML other m 2017-08-31T11:40:03.71
IV.CERT.HHE. ML:1.8 0.0000908 0.42 AML other m 2017-08-31T11:40:18.39
IV.CERT.HHN. ML:1.6 0.00006345000000000001 0.66 AML other m 2017-08-31T11:40:28.85
IV.GIUL.HHN. ML:1.9 0.0001885 0.54 AML other m 2017-08-31T11:40:13.31
IV.GIUL.HHE. ML:1.7 0.0001275 0.3 AML other m 2017-08-31T11:40:13.77
IV.GUAR.HHE. ML:1.7 0.00014350000000000002 0.72 AML other m 2017-08-31T11:40:10.38
IV.GUAR.HHN. ML:1.8 0.000168 1.1 AML other m 2017-08-31T11:40:12.69
IV.INTR.HHN. ML:2.2 0.000902 0.36 AML other m 2017-08-31T11:40:07.43
IV.INTR.HHE. ML:1.9 0.000434 0.74 AML other m 2017-08-31T11:40:04.54
IV.LATB.EHE. ML:1.3 0.00002672 1.6 AML other m 2017-08-31T11:40:18.13
IV.LATB.EHN. ML:1.0 0.000015214999999999997 0.42 AML other m 2017-08-31T11:40:24.52
IV.LPEL.HHE. ML:2.1 0.000432 0.18 AML other m 2017-08-31T11:40:09.23
IV.LPEL.HHN. ML:2.1 0.0004505 0.18 AML other m 2017-08-31T11:40:09.43
IV.LRP.EHN. ML:2.2 0.0008880000000000001 0.28 AML other m 2017-08-31T11:40:04.48
IV.LRP.EHE. ML:2.2 0.0008255000000000001 0.62 AML other m 2017-08-31T11:40:04.58
IV.MCI.EHE. ML:2.4 0.00128 0.28 AML other m 2017-08-31T11:40:08.03
IV.MCI.EHN. ML:2.4 0.00106 0.26 AML other m 2017-08-31T11:40:08.06
IV.MIDA.HHE. ML:2.1 0.00044950000000000003 0.38 AML other m 2017-08-31T11:40:07.16
IV.MIDA.HHN. ML:1.9 0.00032599999999999996 0.52 AML other m 2017-08-31T11:40:08.35
IV.MIDA.HNE. ML:2.0 0.00036108825 0 AML other m 2017-08-31T11:40:07.36
IV.MIDA.HNN. ML:1.8 0.00023509903999999998 0.1408 AML other m 2017-08-31T11:40:08.54
IV.MODR.HHN. ML:1.9 0.00011949999999999999 0.52 AML other m 2017-08-31T11:40:19.95
IV.MODR.HHE. ML:1.6 0.00006950000000000001 0.34 AML other m 2017-08-31T11:40:21.29
IV.POFI.HHN. ML:2.5 0.0032 0.1 AML other m 2017-08-31T11:40:00.83
IV.POFI.HNN. ML:2.5 0.0029699999999999996 0.12 AML other m 2017-08-31T11:40:00.83
IV.POFI.HNE. ML:2.3 0.001905 0.12 AML other m 2017-08-31T11:40:00.76
IV.PTQR.HHE. ML:1.5 0.00010225 1.16 AML other m 2017-08-31T11:40:11.96
IV.PTQR.HHN. ML:1.5 0.00010085 0.44 AML other m 2017-08-31T11:40:10.71
IV.RNI2.HHE. ML:2.3 0.001155 0.12 AML other m 2017-08-31T11:40:06.31
IV.RNI2.HNE. ML:2.3 0.0010625 0.14 AML other m 2017-08-31T11:40:06.32
IV.RNI2.HHN. ML:2.3 0.00121 1.58 AML other m 2017-08-31T11:40:05.88
IV.RNI2.HNN. ML:2.3 0.0011185000000000001 1.6 AML other m 2017-08-31T11:40:05.89
IV.T0110.HHN. ML:2.1 0.0003145 0.34 AML other m 2017-08-31T11:40:11.36
IV.T0110.HHE. ML:2.2 0.00040849999999999995 1.42 AML other m 2017-08-31T11:40:12.11
IV.TRIV.HHE. ML:1.6 0.0000791 0.52 AML other m 2017-08-31T11:40:17.12
IV.TRIV.HHN. ML:1.6 0.0000902 1.2 AML other m 2017-08-31T11:40:17.91
IV.VAGA.HHE. ML:1.8 0.00015099999999999998 0.34 AML other m 2017-08-31T11:40:13.71
IV.VAGA.HHN. ML:1.9 0.00020800000000000001 0.3 AML other m 2017-08-31T11:40:16.73
IV.VCEL.EHN. ML:2.0 0.000193 0.96 AML other m 2017-08-31T11:40:18.34
IV.VCEL.EHE. ML:2.1 0.0002205 1.14 AML other m 2017-08-31T11:40:18.61
IV.VVLD.HHN. ML:2.4 0.001685 0.18 AML other m 2017-08-31T11:40:03.18
IV.VVLD.HHE. ML:2.3 0.001495 0.56 AML other m 2017-08-31T11:40:03.05
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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Type Description Link
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