Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 22-08-2021 and time 15:40:25 (Italy) in region 8 km N Sellano (PG)

A magnitude ML 1.3 earthquake occured in region: 8 km N Sellano (PG), on

  • 22-08-2021 13:40:25 (UTC)
  • 22-08-2021 15:40:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9590, 12.9020 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Sellano PG 8 1079 1079
Monte Cavallo MC 9 145 1224
Serravalle di Chienti MC 13 1070 2294
Preci PG 14 724 3018
Cerreto di Spoleto PG 15 1075 4093
Trevi PG 15 8469 12562
Pieve Torina MC 16 1458 14020
Visso MC 16 1107 15127
Foligno PG 16 57155 72282
Valtopina PG 16 1398 73680
Fiordimonte MC 18 202 73882
Muccia MC 18 915 74797
Campello sul Clitunno PG 18 2442 77239
Pievebovigliana MC 19 866 78105
Spello PG 19 8645 86750
Nocera Umbra PG 19 5839 92589
Ussita MC 19 444 93033

Municipalities with at least 50000 inhabitants

An earthquake occurred to
16 Km E of Foligno (57155 inhabitants)
45 Km E of Perugia (166134 inhabitants)
49 Km NE of Terni (111501 inhabitants)
74 Km W of Teramo (54892 inhabitants)
79 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
89 Km SW of Ancona (100861 inhabitants)
99 Km S of Fano (60888 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
Reviewed
Rev100 		ML 1.3 2021-08-22
13:40:25		 42.9587 12.9018 10 2021-08-22
13:49:08		 Sala Sismica INGV-Roma 94500571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-22 13:40:25 ± 0.05
Latitude 42.9587 ± 0.0027
Longitude 12.9018 ± 0.0025
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 94500571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 339
Semi-minor axis of confidence ellipse (meter) 113
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 26
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 131
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.46855
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 22
Type of magnitude ML
Reference to an origin 94500571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-22 13:49:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RDP.HHZ. 2021-08-22T13:41:02.30 3.0 undecidable manual S -2.84 0
IV.ARVD.HHZ. 2021-08-22T13:40:36.37 3.0 positive manual P -0.16 0
IV.CING.HHZ. 2021-08-22T13:40:35.00 0.3 undecidable manual P 27 52.0035 50 -0.04 69
IV.CSP1.EHZ. 2021-08-22T13:40:35.75 0.1 undecidable manual S 59 28.6491 50 -0.06 95
IV.MC2.EHZ. 2021-08-22T13:40:34.50 0.1 undecidable manual S 103 23.8539 113 0.01 97
IV.MURB.HHZ. 2021-08-22T13:40:34.16 0.3 positive manual P 318 45.5211 50 0.11 69
IV.NRCA.HHZ. 2021-08-22T13:40:33.69 0.1 undecidable manual S 129 22.1556 114 -0.24 93
IV.EL6.EHZ. 2021-08-22T13:40:33.85 0.6 positive manual P 21 44.2224 50 0.01 47
IV.LNSS.HHZ. 2021-08-22T13:40:33.24 0.6 negative manual P 164 41.0256 50 -0.12 46
IV.ASSB.HHZ. 2021-08-22T13:40:33.63 0.1 undecidable manual S 295 21.867 115 -0.2 94
IV.ATCC.EHZ. 2021-08-22T13:40:32.13 0.1 negative manual P 320 32.9448 50 0.03 95
IV.FDMO.HHZ. 2021-08-22T13:40:32.15 0.1 undecidable manual S 60 17.3715 120 -0.3 93
IV.MML1.EHZ. 2021-08-22T13:40:32.63 0.1 undecidable manual S 18 18.0708 119 -0.04 98
IV.CESX.HHZ. 2021-08-22T13:40:32.29 3.0 positive manual P -2.05 0
IV.FEMA.HNN. 2021-08-22T13:40:31.10 0.1 undecidable manual S 88 11.9769 130 0.17 96
IV.CSP1.EHZ. 2021-08-22T13:40:31.43 0.3 positive manual P 59 28.6491 50 -0.02 72
IV.ASSB.HHZ. 2021-08-22T13:40:30.24 0.1 negative manual P 295 21.867 115 -0.06 97
IV.NRCA.HHZ. 2021-08-22T13:40:30.34 0.1 negative manual P 129 22.1556 114 -0.02 97
IV.MC2.EHZ. 2021-08-22T13:40:30.78 0.6 positive manual P 103 23.8539 113 0.1 48
IT.MTCL.HGN. 2021-08-22T13:40:30.00 0.1 undecidable manual S 64 8.7801 139 -0.14 97
IV.CESI.HHZ. 2021-08-22T13:40:29.38 0.1 undecidable manual S 2 5.0949 153 -0.03 100
IV.FDMO.HHZ. 2021-08-22T13:40:29.57 0.3 positive manual P 60 17.3715 120 0.07 73
IV.MML1.EHZ. 2021-08-22T13:40:29.75 0.3 positive manual P 18 18.0708 119 0.12 72
IT.MTCL.HGN. 2021-08-22T13:40:28.31 0.1 undecidable manual P 64 8.7801 139 0.14 97
IV.CESI.HHZ. 2021-08-22T13:40:28.00 0.1 undecidable manual P 2 5.0949 153 0.25 96
IV.FEMA.HNN. 2021-08-22T13:40:28.90 0.1 undecidable manual P 88 11.9769 130 0.27 94
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHN. ML:1.6 0.0006590000000000001 0.08 AML other m 2021-08-22T13:40:29.47
IV.CESI.HHE. ML:1.6 0.0006274999999999999 0.52 AML other m 2021-08-22T13:40:29.45
IV.FDMO.HHN. ML:1.1 0.000117 0.1 AML other m 2021-08-22T13:40:32.30
IV.MML1.EHE. ML:1.4 0.0002215 0.2 AML other m 2021-08-22T13:40:32.81
IV.FDMO.HHE. ML:1.3 0.000161 0.1 AML other m 2021-08-22T13:40:32.91
IV.MML1.EHN. ML:1.1 0.00011075000000000001 0.3 AML other m 2021-08-22T13:40:33.03
IV.NRCA.HHN. ML:1.6 0.00026849999999999997 0.14 AML other m 2021-08-22T13:40:33.89
IV.ASSB.HHN. ML:1.0 0.00007245 0.32 AML other m 2021-08-22T13:40:34.24
IV.NRCA.HHE. ML:1.4 0.0001725 0.42 AML other m 2021-08-22T13:40:34.24
IV.ASSB.HHE. ML:0.9 0.000052449999999999994 0.16 AML other m 2021-08-22T13:40:34.64
IV.CSP1.EHN. ML:1.5 0.000156 0.34 AML other m 2021-08-22T13:40:35.95
IV.CSP1.EHE. ML:1.5 0.00015365000000000002 1.72 AML other m 2021-08-22T13:40:36.96
IV.ATCC.EHN. ML:1.3 0.00008785 0.3 AML other m 2021-08-22T13:40:37.48
IV.ATCC.EHE. ML:1.1 0.00005885 0.58 AML other m 2021-08-22T13:40:37.38
IV.LNSS.HHN. ML:1.4 0.00008615000000000001 0.42 AML other m 2021-08-22T13:40:39.55
IV.LNSS.HHE. ML:1.5 0.00010125000000000001 0.16 AML other m 2021-08-22T13:40:39.33
IV.MURB.HHE. ML:1.3 0.000055599999999999996 1.22 AML other m 2021-08-22T13:40:42.12
IV.MURB.HHN. ML:1.4 0.00006745 0.16 AML other m 2021-08-22T13:40:42.70
IV.CING.HHN. ML:0.9 0.00002035 0.8 AML other m 2021-08-22T13:40:44.09
IV.CING.HHE. ML:0.9 0.000021 1.16 AML other m 2021-08-22T13:40:44.80
IV.ARVD.HHN. ML:1.0 0.0000192 1 AML other m 2021-08-22T13:40:44.82
IV.ARVD.HHE. ML:1.0 0.000020150000000000002 0.88 AML other m 2021-08-22T13:40:44.82
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