Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 26-08-2021 and time 20:24:30 (Italy) in region 5 km NW Accumoli (RI)

A magnitude ML 1.8 earthquake occured in region: 5 km NW Accumoli (RI), on

  • 26-08-2021 18:24:30 (UTC)
  • 26-08-2021 20:24:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7220, 13.2050 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
Arquata del Tronto AP 10 1178 1845
Cittareale RI 12 482 2327
Norcia PG 12 4957 7284
Amatrice RI 12 2657 9941
Cascia PG 16 3217 13158
Montegallo AP 17 523 13681
Acquasanta Terme AP 18 2916 16597
Castelsantangelo sul Nera MC 20 281 16878

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Teramo (54892 inhabitants)
44 Km NW of L'Aquila (69753 inhabitants)
49 Km SE of Foligno (57155 inhabitants)
49 Km E of Terni (111501 inhabitants)
79 Km SE of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
87 Km W of Pescara (121014 inhabitants)
89 Km W of Chieti (51815 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km NE of Tivoli (56533 inhabitants)
96 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 1.8 2021-08-26
18:24:30		 42.7215 13.2053 10 2021-12-29
11:12:52		 Bollettino Sismico Italiano INGV 97831771
Reviewed
Rev100 		ML 1.8 2021-08-26
18:24:30		 42.7232 13.1992 9 2021-08-26
18:29:20		 Sala Sismica INGV-Roma 94674511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-26 18:24:30 ± 0.06
Latitude 42.7215 ± 0.0027
Longitude 13.2053 ± 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 97831771

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 357
Semi-minor axis of confidence ellipse (meter) 292
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 89
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 38
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.28
Epicentral distance of station closest to the epicenter (degree) 0.10342
Epicentral distance of station farthest from the epicenter (degree) 0.64751
Number of stations at which the event was observed 27
Number of stations from which data was used for origin computation 27
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 97831771
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-26 17:22:52

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 40
Type of magnitude ML
Reference to an origin 94674511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-26 18:29:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MOMA.HHZ. 2021-08-26T18:24:48.32 0.6 undecidable manual S 280 52.503 50 0.87 37
IV.OFFI.HHZ. 2021-08-26T18:24:47.84 0.3 undecidable manual S 59 45.7209 50 2.22 23
IV.FIAM.HHZ. 2021-08-26T18:24:47.12 0.6 undecidable manual S 188 50.8158 50 0.12 46
IV.MML1.EHZ. 2021-08-26T18:24:46.21 0.3 undecidable manual S 336 47.4192 50 0.11 70
IV.CSP1.EHZ. 2021-08-26T18:24:44.28 0.6 undecidable manual S 360 41.1255 50 -0.12 47
IV.GIGS.HHN. 2021-08-26T18:24:44.19 0.6 undecidable manual S 135 42.2244 50 -0.52 43
IV.GUMA.HHZ. 2021-08-26T18:24:44.40 0.3 undecidable manual S 16 39.3273 50 0.48 66
IV.MF5.EHZ. 2021-08-26T18:24:43.87 0.6 undecidable manual S 35 36.0417 50 0.81 39
IV.ARRO.EHZ. 2021-08-26T18:24:43.73 0.6 undecidable manual S 246 39.2274 50 -0.17 47
IV.T0110.HHZ. 2021-08-26T18:24:43.49 0.3 undecidable manual P 139 71.8725 50 0.1 67
IV.CESI.HHE. 2021-08-26T18:24:43.98 0.6 undecidable manual S 322 39.8268 50 -0.09 47
IV.EL6.EHZ. 2021-08-26T18:24:42.56 0.3 undecidable manual P 353 67.9764 50 -0.23 66
IT.MTCL.HGZ. 2021-08-26T18:24:42.21 0.6 undecidable manual S 331 34.5432 50 -0.44 44
IV.TERO.HHZ. 2021-08-26T18:24:42.22 0.3 undecidable manual S 108 34.3434 50 -0.37 68
IV.FDMO.HHZ. 2021-08-26T18:24:42.89 0.6 undecidable manual S 345 36.2415 50 -0.21 47
IV.FAGN.HHZ. 2021-08-26T18:24:41.59 0.6 undecidable manual P 148 59.2962 50 0.14 45
IV.ASSB.HHZ. 2021-08-26T18:24:41.33 0.3 undecidable manual P 309 56.9985 50 0.23 67
IV.FIAM.HHZ. 2021-08-26T18:24:40.03 0.3 undecidable manual P 188 50.8158 50 -0.12 69
IV.GAVE.EHN. 2021-08-26T18:24:40.12 0.6 undecidable manual S 263 25.5522 50 -0.14 48
IV.MNTT.EHZ. 2021-08-26T18:24:40.63 0.6 undecidable manual P 40 49.3173 50 0.71 39
IV.CAMP.HHE. 2021-08-26T18:24:40.08 0.6 undecidable manual S 141 26.4513 50 -0.42 45
IV.MOMA.HHZ. 2021-08-26T18:24:40.56 0.3 undecidable manual P 280 52.503 50 0.14 69
IV.OFFI.HHZ. 2021-08-26T18:24:40.01 0.3 undecidable manual P 59 45.7209 50 0.64 61
IV.RM33.EHZ. 2021-08-26T18:24:39.73 0.6 undecidable manual S 178 23.5542 50 0 50
IV.MML1.EHZ. 2021-08-26T18:24:39.48 0.3 undecidable manual P 336 47.4192 50 -0.16 69
IV.ARRO.EHZ. 2021-08-26T18:24:38.32 0.3 undecidable manual P 246 39.2274 50 -0.04 72
IV.MMO1.EHZ. 2021-08-26T18:24:38.87 0.6 undecidable manual S 27 22.0668 115 -0.39 46
IV.CESI.HHE. 2021-08-26T18:24:38.33 0.3 undecidable manual P 322 39.8268 50 -0.13 71
IV.GUMA.HHZ. 2021-08-26T18:24:38.47 0.3 undecidable manual P 16 39.3273 50 0.09 71
IV.MF5.EHZ. 2021-08-26T18:24:38.00 0.1 undecidable manual P 35 36.0417 50 0.12 95
IV.LNSS.HHZ. 2021-08-26T18:24:38.36 0.6 undecidable manual S 226 18.87 119 0.1 49
IV.CSP1.EHZ. 2021-08-26T18:24:38.40 0.1 undecidable manual P 360 41.1255 50 -0.25 91
IV.MC2.EHZ. 2021-08-26T18:24:38.86 0.6 undecidable manual S 356 21.1677 116 -0.1 49
IV.GIGS.HHN. 2021-08-26T18:24:38.38 0.3 undecidable manual P 135 42.2244 50 -0.45 66
IV.TERO.HHZ. 2021-08-26T18:24:37.42 0.3 undecidable manual P 108 34.3434 50 -0.19 70
IV.SMA1.EHZ. 2021-08-26T18:24:37.03 0.6 undecidable manual S 134 14.6742 125 0.01 50
IV.FDMO.HHZ. 2021-08-26T18:24:37.58 0.1 undecidable manual P 345 36.2415 50 -0.33 91
IV.MTRA.EHZ. 2021-08-26T18:24:37.04 0.3 undecidable manual S 76 16.0728 123 -0.39 70
IT.MTCL.HGZ. 2021-08-26T18:24:37.35 0.3 undecidable manual P 331 34.5432 50 -0.29 69
IV.GAVE.EHN. 2021-08-26T18:24:36.31 0.3 undecidable manual P 263 25.5522 50 0.05 74
IV.T1299.HNN. 2021-08-26T18:24:36.56 0.6 undecidable manual S 147 11.4774 132 0.39 47
IV.CAMP.HHE. 2021-08-26T18:24:36.21 0.3 undecidable manual P 141 26.4513 50 -0.19 71
IV.LNSS.HHZ. 2021-08-26T18:24:35.28 0.1 undecidable manual P 226 18.87 119 0.17 97
IV.MC2.EHZ. 2021-08-26T18:24:35.45 0.1 positive manual P 356 21.1677 116 -0.06 99
IV.MMO1.EHZ. 2021-08-26T18:24:35.44 0.3 undecidable manual P 27 22.0668 115 -0.25 71
IV.RM33.EHZ. 2021-08-26T18:24:35.96 0.1 positive manual P 178 23.5542 50 0.01 99
IV.SMA1.EHZ. 2021-08-26T18:24:34.56 0.1 positive manual P 134 14.6742 125 0.17 98
IV.MTRA.EHZ. 2021-08-26T18:24:34.59 0.1 positive manual P 76 16.0728 123 -0.04 100
IV.T1299.HNN. 2021-08-26T18:24:34.37 0.3 undecidable manual P 147 11.4774 132 0.46 69
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNN. ML:2.0 0.0009559999999999999 0.28 AML other m 2021-08-26T18:24:37.14
IV.SMA1.EHE. ML:1.7 0.0004715 0.22 AML other m 2021-08-26T18:24:37.21
IV.SMA1.EHN. ML:1.6 0.0003725 0.5 AML other m 2021-08-26T18:24:37.89
IV.MTRA.EHN. ML:2.0 0.000979 1.22 AML other m 2021-08-26T18:24:37.15
IV.MTRA.EHE. ML:2.1 0.00121 0.42 AML other m 2021-08-26T18:24:37.60
IV.MTRA.HNE. ML:2.1 0.00115 0.44 AML other m 2021-08-26T18:24:37.59
IV.LNSS.HNE. ML:2.2 0.001143 0.4 AML other m 2021-08-26T18:24:38.58
IV.LNSS.HHE. ML:2.2 0.001135 0.6 AML other m 2021-08-26T18:24:38.58
IV.LNSS.HHN. ML:2.3 0.001495 1.48 AML other m 2021-08-26T18:24:39.77
IV.LNSS.HNN. ML:2.2 0.0013830000000000001 1.46 AML other m 2021-08-26T18:24:39.77
IV.RM33.HNN. ML:2.1 0.000826 0.24 AML other m 2021-08-26T18:24:39.91
IV.RM33.EHN. ML:2.1 0.0008020000000000001 0.24 AML other m 2021-08-26T18:24:39.91
IV.RM33.EHE. ML:1.9 0.00047750000000000006 0.3 AML other m 2021-08-26T18:24:40.18
IV.RM33.HNE. ML:1.9 0.000467 0.32 AML other m 2021-08-26T18:24:40.17
IV.FDMO.HHN. ML:1.3 0.00008705 0.82 AML other m 2021-08-26T18:24:43.09
IV.GUMA.HNE. ML:2.1 0.00046550000000000004 0.34 AML other m 2021-08-26T18:24:44.79
IV.GUMA.HHN. ML:2.0 0.000325 1.3 AML other m 2021-08-26T18:24:44.82
IV.CSP1.EHN. ML:2.0 0.0003195 0.3 AML other m 2021-08-26T18:24:45.39
IV.ARRO.EHE. ML:1.5 0.0001101 1 AML other m 2021-08-26T18:24:45.56
IV.CSP1.EHE. ML:1.8 0.00023649999999999998 1.28 AML other m 2021-08-26T18:24:46.19
IV.ARRO.EHN. ML:1.6 0.00013305 0.86 AML other m 2021-08-26T18:24:46.71
IV.GUMA.HNN. ML:2.0 0.00032 1.68 AML other m 2021-08-26T18:24:46.95
IV.GUMA.HHE. ML:2.2 0.0004995 0.62 AML other m 2021-08-26T18:24:47.42
IV.FIAM.HHE. ML:1.2 0.00004115 0.44 AML other m 2021-08-26T18:24:48.29
IV.MML1.EHN. ML:1.2 0.000049699999999999995 0.18 AML other m 2021-08-26T18:24:48.33
IV.FDMO.HHE. ML:1.2 0.00006565 0.26 AML other m 2021-08-26T18:24:48.79
IV.FIAM.HHN. ML:1.3 0.0000563 1.24 AML other m 2021-08-26T18:24:49.62
IV.MOMA.HHE. ML:1.8 0.000154 0.22 AML other m 2021-08-26T18:24:49.22
IV.OFFI.HHE. ML:2.0 0.0003135 0.6 AML other m 2021-08-26T18:24:49.28
IV.OFFI.HHN. ML:2.0 0.00033 0.92 AML other m 2021-08-26T18:24:49.54
IV.MNTT.EHN. ML:2.3 0.000527 0.42 AML other m 2021-08-26T18:24:49.77
IV.MML1.EHE. ML:1.1 0.00003645 1.26 AML other m 2021-08-26T18:24:50.16
IV.ASSB.HHN. ML:1.3 0.00004085 0.9 AML other m 2021-08-26T18:24:50.74
IV.MNTT.EHE. ML:2.1 0.00033650000000000005 1.64 AML other m 2021-08-26T18:24:51.99
IV.ASSB.HHE. ML:1.2 0.000037 1.04 AML other m 2021-08-26T18:24:51.31
IV.MOMA.HHN. ML:1.6 0.00009295000000000001 0.2 AML other m 2021-08-26T18:24:51.88
IV.FAGN.HHN. ML:1.6 0.0000843 1.42 AML other m 2021-08-26T18:24:56.02
IV.FAGN.HHE. ML:1.5 0.00007195 0.42 AML other m 2021-08-26T18:25:00.13
IV.T0110.HHN. ML:1.5 0.000055599999999999996 0.42 AML other m 2021-08-26T18:25:01.95
IV.T0110.HHE. ML:1.6 0.00006110000000000001 1.22 AML other m 2021-08-26T18:25:05.85
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