Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 22-07-2021 and time 18:30:50 (UTC) in region 5 km E Terni (TR)

A magnitude ML 2.0 earthquake occured in region: 5 km E Terni (TR), on

  • 22-07-2021 18:30:50 (UTC)
  • 22-07-2021 20:30:50 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5460, 12.7080 at 8 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
Terni TR 5 111501 111501
Stroncone TR 6 4917 116418
Arrone TR 7 2763 119181
Montefranco TR 8 1276 120457
Colli sul Velino RI 8 533 120990
Labro RI 8 374 121364
Morro Reatino RI 11 373 121737
Ferentillo TR 11 1913 123650
Greccio RI 11 1558 125208
Polino TR 12 233 125441
Rivodutri RI 13 1253 126694
Configni RI 15 633 127327
San Gemini TR 15 5018 132345
Poggio Bustone RI 15 2055 134400
Cottanello RI 16 563 134963
Contigliano RI 16 3783 138746
Narni TR 16 19785 158531
Montasola RI 18 395 158926
Cantalice RI 18 2755 161681
Vacone RI 19 256 161937
Calvi dell'Umbria TR 20 1856 163793

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km E of Terni (111501 inhabitants)
46 Km S of Foligno (57155 inhabitants)
51 Km E of Viterbo (67173 inhabitants)
61 Km N of Guidonia Montecelio (88673 inhabitants)
61 Km W of L'Aquila (69753 inhabitants)
65 Km N of Tivoli (56533 inhabitants)
68 Km SE of Perugia (166134 inhabitants)
75 Km N of Roma (2864731 inhabitants)
83 Km W of Teramo (54892 inhabitants)
90 Km NE of Civitavecchia (52991 inhabitants)
94 Km NE of Fiumicino (78395 inhabitants)
96 Km N of Velletri (53303 inhabitants)
99 Km N of Pomezia (62966 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 2.0 2021-07-22
18:30:50		 42.5457 12.7077 8 2021-12-29
11:12:35		 Bollettino Sismico Italiano INGV 96347791
Reviewed
Rev100 		ML 1.9 2021-07-22
18:30:50		 42.5368 12.6993 8 2021-07-22
18:48:54		 Sala Sismica INGV-Roma 93076771
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-22 18:30:50 ± 0.06
Latitude 42.5457 ± 0.0027
Longitude 12.7077 ± 0.0037
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 96347791

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 299
Semi-minor axis of confidence ellipse (meter) 219
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 227
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 59
Number of associated phases, regardless of their use for origin computation 57
Number of defining phases 57
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.05396
Epicentral distance of station farthest from the epicenter (degree) 0.83457
Number of stations at which the event was observed 35
Number of stations from which data was used for origin computation 35
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 96347791
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-10-08 12:37:35

ML:1.9

Field Value
Value 1.9
Uncertainty 0.3
Num. used stations 30
Type of magnitude ML
Reference to an origin 93076771
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-22 18:48:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PF6.EHN. 2021-07-22T18:31:14.20 0.6 undecidable manual S 31 76.6677 50 0.34 42
IV.CSP1.EHZ. 2021-07-22T18:31:13.21 0.3 undecidable manual S 34 72.8715 50 0.37 63
IV.ATCC.EHZ. 2021-07-22T18:31:12.75 0.6 undecidable manual S 356 71.1732 50 0.36 42
IV.TERO.HHZ. 2021-07-22T18:31:12.90 0.3 undecidable manual S 83 73.6707 50 -0.17 66
IV.MGAB.HHZ. 2021-07-22T18:31:10.95 0.6 undecidable manual S 310 63.2922 50 0.65 39
IV.MMO1.EHN. 2021-07-22T18:31:10.27 1.0 undecidable manual S 52 63.8916 50 -0.18 22
IV.FDMO.HHZ. 2021-07-22T18:31:10.10 0.3 undecidable manual S 29 62.5929 50 0 69
IV.MTRA.EHE. 2021-07-22T18:31:09.76 0.6 undecidable manual S 67 60.8946 50 0.11 45
IV.MC2.EHZ. 2021-07-22T18:31:08.69 0.6 undecidable manual S 44 56.3991 50 0.23 45
IT.MTCL.HGZ. 2021-07-22T18:31:08.07 0.6 undecidable manual S 25 55.1004 50 -0.03 47
IV.ASSB.HHZ. 2021-07-22T18:31:08.23 0.6 undecidable manual S 356 55.3002 50 0.08 46
IV.SMA1.EHZ. 2021-07-22T18:31:07.30 0.6 undecidable manual S 79 52.1034 50 -0.01 47
IV.CESI.HHE. 2021-07-22T18:31:07.82 0.3 undecidable manual S 17 53.4021 50 0.17 68
IV.EL6.EHZ. 2021-07-22T18:31:06.45 0.6 negative manual P 20 92.6406 50 0.15 42
IV.T1299.HNN. 2021-07-22T18:31:06.40 0.6 undecidable manual S 78 47.9187 50 0.21 46
IT.FOPC.HGN. 2021-07-22T18:31:05.95 0.6 undecidable manual S 360 47.0196 50 0 48
IV.FIAM.HHZ. 2021-07-22T18:31:05.24 0.1 undecidable manual S 132 45.5211 50 -0.31 89
IV.ATLO.EHE. 2021-07-22T18:31:05.58 1.0 undecidable manual P 344 88.7445 50 -0.13 21
IV.ATVA.EHE. 2021-07-22T18:31:05.83 0.6 undecidable manual P 337 88.245 50 0.2 42
IV.MF5.EHN. 2021-07-22T18:31:04.59 0.6 undecidable manual P 51 78.4659 50 0.48 41
IV.MURB.HHE. 2021-07-22T18:31:04.69 1.0 undecidable manual P 349 80.9523 50 0.19 21
IV.FOSV.HNE. 2021-07-22T18:31:04.66 0.3 undecidable manual P 3 83.25 50 -0.19 64
IV.TOLF.HHN. 2021-07-22T18:31:04.31 0.6 undecidable manual P 228 78.8655 50 0.13 44
IV.TERO.HHZ. 2021-07-22T18:31:03.12 0.3 undecidable manual P 83 73.6707 50 -0.26 64
IV.PF6.EHN. 2021-07-22T18:31:03.52 1.0 undecidable manual P 31 76.6677 50 -0.32 21
IV.SACS.HHE. 2021-07-22T18:31:03.74 0.6 undecidable manual P 298 73.2711 50 0.43 41
IV.CSP1.EHZ. 2021-07-22T18:31:03.30 0.1 undecidable manual P 34 72.8715 50 0.05 90
IV.BARO.EHZ. 2021-07-22T18:31:02.10 0.6 undecidable manual P 239 63.0924 50 0.35 43
IV.ATCC.EHZ. 2021-07-22T18:31:02.79 0.6 undecidable manual P 356 71.1732 50 -0.2 44
IV.MTRA.EHE. 2021-07-22T18:31:01.45 0.1 undecidable manual P 67 60.8946 50 0.05 92
IV.MTCE.HHZ. 2021-07-22T18:31:01.17 0.6 undecidable manual P 177 58.0974 50 0.2 45
IV.FDMO.HHZ. 2021-07-22T18:31:01.42 0.3 undecidable manual P 29 62.5929 50 -0.25 66
IV.MGAB.HHZ. 2021-07-22T18:31:01.60 0.6 undecidable manual P 310 63.2922 50 -0.18 44
IV.MMO1.EHN. 2021-07-22T18:31:01.65 0.6 undecidable manual P 52 63.8916 50 -0.22 44
IV.ASSB.HHZ. 2021-07-22T18:31:00.17 0.1 undecidable manual P 356 55.3002 50 -0.37 87
IV.MOMA.HHZ. 2021-07-22T18:31:00.80 0.3 undecidable manual S 339 30.747 104 -0.34 68
IV.MC2.EHZ. 2021-07-22T18:31:00.65 0.1 undecidable manual P 44 56.3991 50 -0.07 92
IT.GNU.HGE. 2021-07-22T18:31:00.83 0.6 undecidable manual S 339 30.747 104 -0.3 46
IT.MTCL.HGZ. 2021-07-22T18:31:00.17 0.3 undecidable manual P 25 55.1004 50 -0.34 65
IV.SMA1.EHZ. 2021-07-22T18:31:00.10 0.1 undecidable manual P 79 52.1034 50 0.05 93
IV.LNSS.HHZ. 2021-07-22T18:30:59.93 0.3 undecidable manual S 77 27.8499 105 -0.25 70
IV.CESI.HHE. 2021-07-22T18:30:59.98 0.1 undecidable manual P 17 53.4021 50 -0.28 89
IT.FOPC.HGN. 2021-07-22T18:30:59.20 0.3 undecidable manual P 360 47.0196 50 -0.07 70
IV.FIAM.HHZ. 2021-07-22T18:30:59.05 0.1 undecidable manual P 132 45.5211 50 0 95
IV.T1299.HNN. 2021-07-22T18:30:59.39 0.3 undecidable manual P 78 47.9187 50 -0.02 71
IV.RM33.EHZ. 2021-07-22T18:30:58.30 0.3 undecidable manual P 95 41.625 50 -0.14 70
IV.GAVE.EHZ. 2021-07-22T18:30:58.71 0.6 undecidable manual S 43 22.2555 109 0.41 46
IV.SRES.HHZ. 2021-07-22T18:30:57.78 0.6 undecidable manual P 205 37.9287 50 -0.08 48
IT.MMP1.HGE. 2021-07-22T18:30:57.17 1.0 undecidable manual P 174 33.0447 103 0.23 23
IT.GNU.HGE. 2021-07-22T18:30:56.26 0.3 undecidable manual P 339 30.747 104 -0.23 70
IV.LNSS.HHZ. 2021-07-22T18:30:56.11 0.3 undecidable manual P 77 27.8499 105 0.17 71
IV.MOMA.HHZ. 2021-07-22T18:30:56.20 0.1 undecidable manual P 339 30.747 104 -0.29 92
IV.GAVE.EHZ. 2021-07-22T18:30:55.04 0.3 undecidable manual P 43 22.2555 109 0.18 72
IV.CESX.HHZ. 2021-07-22T18:30:55.03 0.1 undecidable manual S 305 12.0768 122 -0.05 100
IV.CESX.HHZ. 2021-07-22T18:30:53.22 0.1 undecidable manual P 305 12.0768 122 0.22 97
IV.ARRO.EHZ. 2021-07-22T18:30:53.58 0.6 undecidable manual S 52 5.994 141 0.09 50
IV.ARRO.EHZ. 2021-07-22T18:30:52.63 0.3 undecidable manual P 52 5.994 141 0.56 68
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARRO.EHN. ML:2.3 0.00348 0.2 AML other m 2021-07-22T18:30:54.64
IV.ARRO.EHE. ML:2.1 0.00244 0.16 AML other m 2021-07-22T18:30:54.55
IV.LNSS.HHE. ML:2.1 0.0007019999999999999 0.58 AML other m 2021-07-22T18:31:00.52
IV.LNSS.HHN. ML:2.2 0.00083 0.18 AML other m 2021-07-22T18:31:01.22
IV.MOMA.HHN. ML:1.8 0.0003175 0.4 AML other m 2021-07-22T18:31:02.77
IV.MOMA.HHE. ML:2.0 0.000443 0.26 AML other m 2021-07-22T18:31:03.32
IV.RM33.EHE. ML:1.9 0.00023799999999999998 0.2 AML other m 2021-07-22T18:31:06.53
IV.RM33.EHN. ML:1.7 0.00017299999999999998 0.32 AML other m 2021-07-22T18:31:07.37
IV.SMA1.EHE. ML:2.3 0.0005380000000000001 0.32 AML other m 2021-07-22T18:31:08.11
IV.SMA1.EHN. ML:1.9 0.000209 0.26 AML other m 2021-07-22T18:31:09.22
IV.FDMO.HHN. ML:2.0 0.000219 0.18 AML other m 2021-07-22T18:31:11.39
IV.FDMO.HHE. ML:2.2 0.00033 0.22 AML other m 2021-07-22T18:31:11.45
IV.MGAB.HHN. ML:1.7 0.0000988 0.72 AML other m 2021-07-22T18:31:11.33
IV.MGAB.HHE. ML:2.0 0.00021349999999999999 0.76 AML other m 2021-07-22T18:31:12.43
IV.CSP1.EHE. ML:2.1 0.0002195 0.64 AML other m 2021-07-22T18:31:14.42
IV.CSP1.EHN. ML:2.1 0.000203 0.64 AML other m 2021-07-22T18:31:16.51
IV.ATCC.EHN. ML:1.8 0.00011380000000000001 0.74 AML other m 2021-07-22T18:31:18.73
IV.ATCC.EHE. ML:1.8 0.0001072 1.42 AML other m 2021-07-22T18:31:19.76
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