Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 23-08-2021 and time 01:12:55 (Italy) in region 5 km SW Accumoli (RI)

A magnitude ML 1.6 earthquake occured in region: 5 km SW Accumoli (RI), on

  • 22-08-2021 23:12:55 (UTC)
  • 23-08-2021 01:12:55 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6680, 13.1980 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
Accumoli RI 5 667 667
Cittareale RI 6 482 1149
Amatrice RI 9 2657 3806
Arquata del Tronto AP 14 1178 4984
Cascia PG 16 3217 8201
Norcia PG 16 4957 13158
Montereale AQ 16 2581 15739
Posta RI 18 694 16433
Borbona RI 18 617 17050
Capitignano AQ 18 665 17715
Campotosto AQ 19 542 18257

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km NW of L'Aquila (69753 inhabitants)
42 Km W of Teramo (54892 inhabitants)
47 Km E of Terni (111501 inhabitants)
51 Km SE of Foligno (57155 inhabitants)
80 Km W of Montesilvano (53738 inhabitants)
82 Km SE of Perugia (166134 inhabitants)
84 Km NE of Guidonia Montecelio (88673 inhabitants)
85 Km NE of Tivoli (56533 inhabitants)
86 Km W of Pescara (121014 inhabitants)
87 Km W of Chieti (51815 inhabitants)
94 Km E of Viterbo (67173 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 2021-08-22
23:12:55		 42.6683 13.1978 10 2021-12-29
11:12:30		 Bollettino Sismico Italiano INGV 95511571
Reviewed
Rev100 		ML 1.6 2021-08-22
23:12:55		 42.6758 13.1932 9 2021-08-22
23:18:16		 Sala Sismica INGV-Roma 94517011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 23:12:55 ± 0.06
Latitude 42.6683 ± 0.0036
Longitude 13.1978 ± 0.0049
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 95511571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 401
Semi-minor axis of confidence ellipse (meter) 375
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 140
Circular confidence region, given by single value of horizontal uncertainty (meter) 400.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 53
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 39
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.54409
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 95511571
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-16 16:02:06

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 94517011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 23:18:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GIUL.HHZ. 2021-08-22T23:13:12.30 3.0 undecidable manual P -3.88 0
IV.GUMA.HHZ. 2021-08-22T23:13:10.79 0.6 undecidable manual S 14 45.1215 50 0.77 39
IV.CSP1.EHZ. 2021-08-22T23:13:10.60 0.3 undecidable manual S 1 47.0196 50 0.09 72
IV.FIAM.HHZ. 2021-08-22T23:13:10.02 0.6 undecidable manual S 188 44.9217 50 0.08 48
IV.MF5.EHZ. 2021-08-22T23:13:09.56 0.6 undecidable manual S 31 41.3253 50 0.56 43
IV.FDMO.HHZ. 2021-08-22T23:13:08.87 0.6 undecidable manual S 348 41.8248 50 -0.26 46
IV.ARRO.EHZ. 2021-08-22T23:13:07.58 0.6 undecidable manual S 254 36.6411 50 -0.17 48
IV.ASSB.HHZ. 2021-08-22T23:13:06.30 0.3 undecidable manual P 314 60.3951 50 0.14 69
IV.TERO.HHZ. 2021-08-22T23:13:06.09 0.6 undecidable manual S 99 33.5442 50 -0.82 39
IV.MNTT.EHZ. 2021-08-22T23:13:05.94 0.3 undecidable manual P 36 54.3012 50 0.71 60
IV.OFFI.HHZ. 2021-08-22T23:13:05.17 0.1 positive manual P 53 49.5171 50 0.69 81
IV.MOMA.HHZ. 2021-08-22T23:13:05.12 0.3 undecidable manual P 287 53.3022 50 0.05 71
IV.CESX.HHZ. 2021-08-22T23:13:04.58 0.3 undecidable manual P 263 50.3163 50 -0.03 72
IV.GAVE.EHZ. 2021-08-22T23:13:04.39 0.6 undecidable manual S 276 24.8529 50 -0.22 48
IV.CSP1.EHZ. 2021-08-22T23:13:04.01 0.1 negative manual P 1 47.0196 50 -0.09 96
IV.MMO1.EHZ. 2021-08-22T23:13:04.90 0.6 undecidable manual S 22 27.6501 50 -0.46 46
IV.MC2.EHZ. 2021-08-22T23:13:04.89 0.6 undecidable manual S 358 26.9508 50 -0.28 48
IV.FIAM.HHZ. 2021-08-22T23:13:03.59 0.3 undecidable manual P 188 44.9217 50 -0.17 71
IV.FDMO.HHZ. 2021-08-22T23:13:03.09 0.3 undecidable manual P 348 41.8248 50 -0.2 71
IV.CAMP.HHZ. 2021-08-22T23:13:03.43 0.6 undecidable manual S 130 22.6551 114 -0.53 45
IV.MF5.EHZ. 2021-08-22T23:13:03.44 0.1 positive manual P 31 41.3253 50 0.21 94
IV.GUMA.HHZ. 2021-08-22T23:13:03.99 0.1 positive manual P 14 45.1215 50 0.18 94
IV.MTRA.EHZ. 2021-08-22T23:13:02.11 0.6 undecidable manual S 59 18.9699 118 -0.69 43
IV.RM33.EHZ. 2021-08-22T23:13:02.47 0.6 undecidable manual S 176 17.7711 120 0.03 51
IV.ARRO.EHZ. 2021-08-22T23:13:02.41 0.1 positive manual P 254 36.6411 50 -0.09 97
IV.NRCA.HHZ. 2021-08-22T23:13:02.57 0.6 undecidable manual S 340 19.5693 118 -0.42 47
IV.LNSS.HHZ. 2021-08-22T23:13:01.49 0.6 undecidable manual S 241 14.7741 125 -0.08 51
IV.TERO.HHZ. 2021-08-22T23:13:01.66 0.3 undecidable manual P 99 33.5442 50 -0.36 69
IV.GAVE.EHZ. 2021-08-22T23:13:00.63 0.1 positive manual P 276 24.8529 50 -0.06 100
IV.MMO1.EHZ. 2021-08-22T23:13:00.86 0.1 positive manual P 22 27.6501 50 -0.26 95
IV.SMA1.EHZ. 2021-08-22T23:13:00.94 0.6 undecidable manual S 110 11.9769 131 0.14 50
IV.MC2.EHZ. 2021-08-22T23:13:00.95 0.1 negative manual P 358 26.9508 50 -0.06 100
IV.CAMP.HHZ. 2021-08-22T23:13:00.17 0.1 undecidable manual P 130 22.6551 114 -0.14 99
IV.NRCA.HHZ. 2021-08-22T23:12:59.63 0.1 negative manual P 340 19.5693 118 -0.12 100
IV.LNSS.HHZ. 2021-08-22T23:12:59.22 0.1 positive manual P 241 14.7741 125 0.29 97
IV.MTRA.EHZ. 2021-08-22T23:12:59.48 0.1 positive manual P 59 18.9699 118 -0.17 99
IV.T1299.HNN. 2021-08-22T23:12:59.80 0.6 undecidable manual S 119 7.881 143 -0.02 52
IV.RM33.EHZ. 2021-08-22T23:12:59.58 0.1 positive manual P 176 17.7711 120 0.15 99
IV.SMA1.EHZ. 2021-08-22T23:12:58.73 0.1 positive manual P 110 11.9769 131 0.24 98
IV.T1299.HNN. 2021-08-22T23:12:58.24 0.1 positive manual P 119 7.881 143 0.32 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:2.0 0.00106 0.3 AML other m 2021-08-22T23:13:01.33
IV.SMA1.EHE. ML:1.9 0.000894 0.16 AML other m 2021-08-22T23:13:01.56
IV.LNSS.HHN. ML:1.8 0.00059520675 0.1792 AML other m 2021-08-22T23:13:02.00
IV.LNSS.HNE. ML:1.9 0.00069991905 0.1536 AML other m 2021-08-22T23:13:02.12
IV.LNSS.HHE. ML:1.9 0.0007754122 0.1536 AML other m 2021-08-22T23:13:02.12
IV.LNSS.HNN. ML:1.7 0.00052458735 0.2816 AML other m 2021-08-22T23:13:02.33
IV.NRCA.HHN. ML:2.0 0.000813411 0.128 AML other m 2021-08-22T23:13:02.69
IV.RM33.EHN. ML:1.8 0.00046550000000000004 0.14 AML other m 2021-08-22T23:13:02.77
IV.RM33.HNN. ML:1.7 0.00043676740000000004 0.1408 AML other m 2021-08-22T23:13:02.78
IV.MTRA.EHN. ML:1.5 0.00025085715 0.2432 AML other m 2021-08-22T23:13:02.74
IV.MTRA.HNE. ML:1.7 0.00034816314999999996 0.2688 AML other m 2021-08-22T23:13:03.10
IV.RM33.HNE. ML:1.5 0.00027569705 0.1792 AML other m 2021-08-22T23:13:02.96
IV.RM33.EHE. ML:1.5 0.00028680745 0.2048 AML other m 2021-08-22T23:13:03.07
IV.MTRA.EHE. ML:1.6 0.0003396036 0.256 AML other m 2021-08-22T23:13:03.10
IV.NRCA.HHE. ML:2.2 0.0011743915 0.1152 AML other m 2021-08-22T23:13:03.03
IV.NRCA.HNE. ML:2.1 0.00104481055 0.1152 AML other m 2021-08-22T23:13:03.03
IV.NRCA.HNN. ML:2.0 0.0007375000000000001 0.1 AML other m 2021-08-22T23:13:03.18
IV.GAVE.HNN. ML:1.4 0.00016140235 0.1152 AML other m 2021-08-22T23:13:04.89
IV.GAVE.EHN. ML:1.9 0.0005023185 0.128 AML other m 2021-08-22T23:13:04.90
IV.MOMA.HNN. ML:1.7 0.000130035445 0.8832 AML other m 2021-08-22T23:13:04.70
IV.GAVE.EHE. ML:2.1 0.0007315 0.2 AML other m 2021-08-22T23:13:05.22
IV.GAVE.HNE. ML:2.1 0.0007095755999999999 0.192 AML other m 2021-08-22T23:13:05.22
IV.MTRA.HNN. ML:1.5 0.00026985379999999997 0.4736 AML other m 2021-08-22T23:13:06.36
IV.TERO.HHN. ML:1.6 0.0001754367 0.1024 AML other m 2021-08-22T23:13:06.70
IV.TERO.HNN. ML:1.7 0.0002242422 0.0896 AML other m 2021-08-22T23:13:06.94
IV.TERO.HNE. ML:1.6 0.000160642 0.128 AML other m 2021-08-22T23:13:07.16
IV.ARRO.EHE. ML:1.1 0.0000498 0.66 AML other m 2021-08-22T23:13:09.45
IV.MOMA.HNE. ML:1.7 0.00010988691000000001 0.704 AML other m 2021-08-22T23:13:09.52
IV.MF5.EHE. ML:1.3 0.00007157475150000001 0.3968 AML other m 2021-08-22T23:13:10.12
IV.ARRO.EHN. ML:1.1 0.00004473965 0.32 AML other m 2021-08-22T23:13:09.84
IV.MF5.EHN. ML:1.4 0.00008013371 0.2048 AML other m 2021-08-22T23:13:10.04
IV.FIAM.HHE. ML:1.0 0.00002835 0.16 AML other m 2021-08-22T23:13:10.19
IV.FIAM.HHN. ML:0.9 0.0000252 0.56 AML other m 2021-08-22T23:13:10.91
IV.GUMA.HHE. ML:2.0 0.0003015 1.7 AML other m 2021-08-22T23:13:10.99
IV.FDMO.HHN. ML:1.1 0.000043311144999999996 0.1024 AML other m 2021-08-22T23:13:11.08
IV.CSP1.EHN. ML:1.8 0.00018654025 0.192 AML other m 2021-08-22T23:13:11.56
IV.FDMO.HHE. ML:1.1 0.0000445595 0.1792 AML other m 2021-08-22T23:13:11.48
IV.GUMA.HHN. ML:1.8 0.0001740856 0.32 AML other m 2021-08-22T23:13:11.48
IV.FIAM.HNN. ML:1.6 0.00012047064999999998 0.6144 AML other m 2021-08-22T23:13:12.52
IV.CSP1.EHE. ML:1.6 0.00010888614 0.2176 AML other m 2021-08-22T23:13:12.37
IV.CESX.HHN. ML:1.1 0.00003035 0.2 AML other m 2021-08-22T23:13:13.89
IV.OFFI.HHE. ML:1.6 0.000094138885 0.4224 AML other m 2021-08-22T23:13:14.15
IV.MOMA.HHE. ML:1.5 0.00008155 1.12 AML other m 2021-08-22T23:13:14.63
IV.MOMA.HHN. ML:1.5 0.00007095 0.3 AML other m 2021-08-22T23:13:15.72
IV.ASSB.HHE. ML:1.2 0.0000367 1.4 AML other m 2021-08-22T23:13:15.21
IV.OFFI.HHN. ML:1.5 0.00008026921850000001 0.32 AML other m 2021-08-22T23:13:16.49
IV.ASSB.HHN. ML:1.2 0.000033851905 0.1408 AML other m 2021-08-22T23:13:16.47
IV.TERO.HHE. ML:1.8 0.0002452932 0.7168 AML other m 2021-08-22T23:13:17.23
IV.FIAM.HNE. ML:2.8 0.0020826125 1.152 AML other m 2021-08-22T23:13:17.54
IV.MNTT.EHE. ML:1.7 0.00011695893499999999 0.1792 AML other m 2021-08-22T23:13:17.61
IV.MNTT.EHN. ML:1.6 0.000100849206 0.2432 AML other m 2021-08-22T23:13:18.80
IV.CESX.HHE. ML:1.0 0.000025175340000000002 0.2432 AML other m 2021-08-22T23:13:20.25
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