Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 13-08-2021 and time 01:31:23 (Italy) in region 5 km E Terni (TR)

A magnitude ML 1.8 earthquake occured in region: 5 km E Terni (TR), on

  • 12-08-2021 23:31:23 (UTC)
  • 13-08-2021 01:31:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5450, 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 14 633 127327
San Gemini TR 15 5018 132345
Poggio Bustone RI 15 2055 134400
Cottanello RI 15 563 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 1.8 2021-08-12
23:31:23		 42.545 12.7077 8 2021-12-29
11:12:24		 Bollettino Sismico Italiano INGV 94918751
Reviewed
Rev100 		ML 1.9 2021-08-12
23:31:23		 42.547 12.7087 8 2021-08-12
23:39:52		 Sala Sismica INGV-Roma 94040991
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-12 23:31:23 ± 0.06
Latitude 42.5450 ± 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 94918751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 306
Semi-minor axis of confidence ellipse (meter) 217
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 42
Circular confidence region, given by single value of horizontal uncertainty (meter) 310.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 66
Number of defining phases 58
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.99825
Number of stations at which the event was observed 43
Number of stations from which data was used for origin computation 35
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 48
Type of magnitude ML
Reference to an origin 94918751
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-18 17:19:15

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 38
Type of magnitude ML
Reference to an origin 94040991
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-12 23:39:52
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
GU.IMI.HHZ. 2021-08-12T23:33:09.73 3.0 undecidable manual Sn 2.96 0
IV.ZEN8.EHZ. 2021-08-12T23:33:01.82 3.0 undecidable manual Sn 4.22 0
IV.PLLN.EHZ. 2021-08-12T23:32:38.81 3.0 positive manual Pn 4.57 0
GU.MGRO.HHZ. 2021-08-12T23:32:34.26 3.0 undecidable manual Pg 11.18 0
CR.STON.BHZ. 2021-08-12T23:32:29.00 3.0 negative manual Pg 8.34 0
IX.SCL3.EHZ.02 2021-08-12T23:32:12.05 3.0 positive manual Pn 3.61 0
GU.GRAM.HHZ. 2021-08-12T23:32:08.03 3.0 negative manual Pn 0.69 0
IV.MTMR.EHZ. 2021-08-12T23:32:03.05 3.0 undecidable manual Pn 0.57 0
IV.CSP1.EHZ. 2021-08-12T23:31:46.84 1.0 undecidable manual S 34 72.8715 50 0.43 21
IV.CERT.HHZ. 2021-08-12T23:31:45.72 1.0 undecidable manual S 161 69.8745 50 0.12 23
IV.MGAB.HHZ. 2021-08-12T23:31:44.72 1.0 undecidable manual S 310 63.3921 50 0.84 19
IV.MMO1.EHZ. 2021-08-12T23:31:44.26 1.0 undecidable manual S 52 63.9915 50 0.23 23
IV.FDMO.HHZ. 2021-08-12T23:31:43.88 0.3 undecidable manual S 29 62.6928 50 0.2 69
IV.MC2.EHZ. 2021-08-12T23:31:42.00 0.6 undecidable manual S 44 56.499 50 -0.03 48
IV.PIEI.HHZ. 2021-08-12T23:31:42.82 0.3 undecidable manual P 353 110.8002 50 0.13 63
IV.MNTT.EHZ. 2021-08-12T23:31:41.22 0.3 undecidable manual P 51 92.241 50 1.39 41
IV.FEMA.HNE. 2021-08-12T23:31:41.84 1.0 undecidable manual S 31 54.0015 50 0.47 22
IT.MTCL.HGE. 2021-08-12T23:31:41.58 1.0 undecidable manual S 25 55.2003 50 -0.1 24
IV.ASSB.HHZ. 2021-08-12T23:31:41.83 0.3 undecidable manual S 356 55.3002 50 0.1 71
IV.CING.HHZ. 2021-08-12T23:31:41.10 0.3 undecidable manual P 23 100.3218 50 0.03 66
IV.CESI.HHZ. 2021-08-12T23:31:41.33 0.3 undecidable manual S 17 53.502 50 0.1 71
IV.SMA1.EHZ. 2021-08-12T23:31:40.93 1.0 undecidable manual S 79 52.1034 50 0.06 24
IV.OFFI.HHZ. 2021-08-12T23:31:40.70 0.3 undecidable manual P 61 90.6426 50 1.12 47
IV.FIAM.HHZ. 2021-08-12T23:31:39.19 1.0 undecidable manual S 132 45.5211 50 0.09 24
IV.T1299.HNN. 2021-08-12T23:31:39.37 0.6 undecidable manual S 78 47.9187 50 -0.39 45
IT.FOPC.HGN. 2021-08-12T23:31:39.64 1.0 undecidable manual S 360 47.1195 50 0.11 24
IV.NRCA.HHZ. 2021-08-12T23:31:39.14 0.3 undecidable manual S 46 46.1205 50 -0.11 72
IV.EL6.EHZ. 2021-08-12T23:31:39.80 0.3 undecidable manual P 20 92.7405 50 -0.1 66
IV.FOSV.EHZ. 2021-08-12T23:31:38.43 0.3 undecidable manual P 3 83.25 50 -0.02 69
IV.MURB.HHZ. 2021-08-12T23:31:38.13 0.3 undecidable manual P 349 81.0522 50 0.03 69
IV.MF5.EHZ. 2021-08-12T23:31:38.30 0.6 undecidable manual P 51 78.4659 50 0.58 40
IV.SRES.HHZ. 2021-08-12T23:31:37.42 0.6 undecidable manual S 205 37.8288 50 0.37 46
IV.TOLF.HHZ. 2021-08-12T23:31:37.76 0.6 undecidable manual P 228 78.8655 50 -0.01 46
IV.RM33.EHZ. 2021-08-12T23:31:37.65 0.3 undecidable manual S 95 41.625 50 -0.42 68
IV.CSP1.EHZ. 2021-08-12T23:31:36.80 0.3 undecidable manual P 34 72.8715 50 -0.05 70
IV.CERT.HHZ. 2021-08-12T23:31:36.08 0.3 undecidable manual P 161 69.8745 50 -0.3 66
IV.ATCC.EHZ. 2021-08-12T23:31:36.49 0.1 undecidable manual P 356 71.1732 50 -0.1 92
IT.MMP1.HGE. 2021-08-12T23:31:35.04 1.0 undecidable manual S 174 32.9448 103 -0.51 23
IV.MGAB.HHZ. 2021-08-12T23:31:35.47 0.3 undecidable manual P 310 63.3921 50 0.09 70
IV.FDMO.HHZ. 2021-08-12T23:31:35.03 0.1 undecidable manual P 29 62.6928 50 -0.24 91
IV.BARO.EHE. 2021-08-12T23:31:35.41 0.3 undecidable manual P 239 63.0924 50 0.07 71
IV.MMO1.EHZ. 2021-08-12T23:31:35.19 0.3 undecidable manual P 52 63.9915 50 -0.28 67
IV.MC2.EHZ. 2021-08-12T23:31:34.23 0.1 undecidable manual P 44 56.499 50 -0.09 95
IV.MOMA.HHZ. 2021-08-12T23:31:34.43 0.6 undecidable manual S 339 30.8469 104 -0.39 47
IV.MTCE.HHE. 2021-08-12T23:31:34.69 0.6 undecidable manual P 177 57.9975 50 0.14 47
IT.GNU.HGZ. 2021-08-12T23:31:34.60 0.6 undecidable manual S 339 30.8469 104 -0.22 48
IV.ASSB.HHZ. 2021-08-12T23:31:33.84 0.1 undecidable manual P 356 55.3002 50 -0.3 91
IV.LNSS.HHZ. 2021-08-12T23:31:33.81 0.3 undecidable manual S 77 27.9498 106 -0.03 76
IV.CESI.HHZ. 2021-08-12T23:31:33.59 0.1 undecidable manual P 17 53.502 50 -0.26 92
IV.SMA1.EHZ. 2021-08-12T23:31:33.64 0.1 undecidable manual P 79 52.1034 50 -0.01 97
IV.FEMA.HNE. 2021-08-12T23:31:33.83 0.6 undecidable manual P 31 54.0015 50 -0.11 47
IT.MTCL.HGE. 2021-08-12T23:31:33.88 0.6 undecidable manual P 25 55.2003 50 -0.23 46
IV.GAVE.EHZ. 2021-08-12T23:31:32.34 0.3 undecidable manual S 43 22.3554 109 0.35 72
IT.FOPC.HGN. 2021-08-12T23:31:32.76 0.6 undecidable manual P 360 47.1195 50 -0.12 48
IV.NRCA.HHZ. 2021-08-12T23:31:32.42 0.1 undecidable manual P 46 46.1205 50 -0.29 93
IV.FIAM.HHZ. 2021-08-12T23:31:32.62 0.3 undecidable manual P 132 45.5211 50 -0.01 74
IV.T1299.HNN. 2021-08-12T23:31:32.97 0.1 undecidable manual P 78 47.9187 50 -0.04 97
IV.SRES.HHZ. 2021-08-12T23:31:31.45 0.3 undecidable manual P 205 37.8288 50 0.01 75
IV.RM33.EHZ. 2021-08-12T23:31:31.85 0.3 undecidable manual P 95 41.625 50 -0.18 72
IT.MMP1.HGE. 2021-08-12T23:31:30.68 0.6 undecidable manual P 174 32.9448 103 0.1 49
IT.GNU.HGZ. 2021-08-12T23:31:29.97 0.6 undecidable manual P 339 30.8469 104 -0.18 49
IV.LNSS.HHZ. 2021-08-12T23:31:29.75 0.1 positive manual P 77 27.9498 106 0.16 99
IV.MOMA.HHZ. 2021-08-12T23:31:29.88 0.1 positive manual P 339 30.8469 104 -0.27 96
IV.CESX.HHZ. 2021-08-12T23:31:28.90 0.3 undecidable manual S 306 12.1767 123 0.1 77
IV.GAVE.EHZ. 2021-08-12T23:31:28.66 0.1 undecidable manual P 43 22.3554 109 0.13 100
IV.CESX.HHZ. 2021-08-12T23:31:26.89 0.3 undecidable manual P 306 12.1767 123 0.21 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHE. ML:1.6 0.0004955 0.5 AML other m 2021-08-12T23:31:31.59
IV.CESX.HHN. ML:1.7 0.0006485 0.26 AML other m 2021-08-12T23:31:31.60
IV.LNSS.HHE. ML:2.0 0.0005434999999999999 0.28 AML other m 2021-08-12T23:31:34.06
IV.LNSS.HHN. ML:2.2 0.0007920000000000001 0.26 AML other m 2021-08-12T23:31:34.79
IV.GAVE.EHN. ML:1.9 0.0006005 1.26 AML other m 2021-08-12T23:31:35.74
IV.MOMA.HHE. ML:2.0 0.0004429999999999999 0.18 AML other m 2021-08-12T23:31:35.24
IV.MOMA.HNE. ML:1.9 0.0004065 0.18 AML other m 2021-08-12T23:31:35.25
IV.MOMA.HHN. ML:1.8 0.000331 0.64 AML other m 2021-08-12T23:31:35.46
IV.MOMA.HNN. ML:1.7 0.000263 0.64 AML other m 2021-08-12T23:31:35.79
IV.GAVE.EHE. ML:1.9 0.0005885 0.38 AML other m 2021-08-12T23:31:35.74
IV.RM33.EHE. ML:1.8 0.000201 1.28 AML other m 2021-08-12T23:31:38.25
IV.SRES.HHE. ML:1.4 0.00010065000000000001 0.7 AML other m 2021-08-12T23:31:39.59
IV.SRES.HHN. ML:1.3 0.0000741 0.62 AML other m 2021-08-12T23:31:39.75
IV.NRCA.HHN. ML:1.7 0.0001555 0.12 AML other m 2021-08-12T23:31:40.87
IV.NRCA.HHE. ML:1.9 0.0002385 0.12 AML other m 2021-08-12T23:31:40.97
IV.RM33.EHN. ML:1.6 0.00014749999999999998 1.62 AML other m 2021-08-12T23:31:41.95
IV.FIAM.HHE. ML:0.9 0.0000264 0.38 AML other m 2021-08-12T23:31:41.79
IV.SMA1.EHE. ML:2.2 0.000352 0.34 AML other m 2021-08-12T23:31:41.82
IV.CESI.HHE. ML:1.9 0.0001805 1.02 AML other m 2021-08-12T23:31:42.48
IV.CESI.HHN. ML:2.1 0.00030199999999999997 0.24 AML other m 2021-08-12T23:31:42.53
IV.SMA1.EHN. ML:1.8 0.00016800000000000002 0.32 AML other m 2021-08-12T23:31:42.74
IV.ASSB.HHN. ML:1.8 0.0001285 1.8 AML other m 2021-08-12T23:31:42.96
IV.ASSB.HHE. ML:1.8 0.00014600000000000003 0.42 AML other m 2021-08-12T23:31:43.70
IV.FDMO.HHN. ML:2.0 0.00017749999999999998 0.2 AML other m 2021-08-12T23:31:44.98
IV.FDMO.HHE. ML:2.1 0.00023249999999999999 0.16 AML other m 2021-08-12T23:31:45.14
IV.FIAM.HHN. ML:1.0 0.00002815 0.78 AML other m 2021-08-12T23:31:45.89
IV.MGAB.HHN. ML:1.6 0.00008510000000000001 0.16 AML other m 2021-08-12T23:31:45.72
IV.MGAB.HHE. ML:1.9 0.000147 0.78 AML other m 2021-08-12T23:31:46.45
IV.CERT.HHN. ML:1.4 0.000044149999999999996 0.56 AML other m 2021-08-12T23:31:47.55
IV.CSP1.EHE. ML:2.1 0.000178 0.2 AML other m 2021-08-12T23:31:48.43
IV.CSP1.EHN. ML:1.9 0.0001295 0.94 AML other m 2021-08-12T23:31:48.67
IV.ATCC.EHE. ML:1.8 0.00009659999999999999 0.44 AML other m 2021-08-12T23:31:48.75
IV.CERT.HHE. ML:1.6 0.00006860000000000001 1.52 AML other m 2021-08-12T23:31:48.99
IV.ATCC.EHN. ML:1.7 0.00008249999999999999 0.78 AML other m 2021-08-12T23:31:49.51
IV.MURB.HHE. ML:2.0 0.000132 1.08 AML other m 2021-08-12T23:31:50.15
IV.FOSV.EHE. ML:1.4 0.00002765 0.74 AML other m 2021-08-12T23:31:52.99
IV.FOSV.EHN. ML:1.4 0.00003625 0.38 AML other m 2021-08-12T23:31:52.86
IV.EL6.EHE. ML:2.0 0.00009910000000000001 0.16 AML other m 2021-08-12T23:31:53.78
IV.MURB.HHN. ML:2.0 0.000135 0.44 AML other m 2021-08-12T23:31:53.74
IV.EL6.EHN. ML:2.0 0.00009984999999999999 0.8 AML other m 2021-08-12T23:31:54.27
IV.OFFI.HHN. ML:2.0 0.00010389999999999999 1.44 AML other m 2021-08-12T23:31:56.03
IV.CING.HHN. ML:1.4 0.000027400000000000002 1.36 AML other m 2021-08-12T23:31:56.14
IV.OFFI.HHE. ML:2.0 0.0001285 0.52 AML other m 2021-08-12T23:31:57.57
IV.MNTT.EHE. ML:2.2 0.00017 0.86 AML other m 2021-08-12T23:31:57.55
IV.CING.HHE. ML:1.4 0.0000252 0.92 AML other m 2021-08-12T23:32:00.27
IV.MNTT.EHN. ML:2.1 0.000136 0.56 AML other m 2021-08-12T23:32:04.28
IV.PIEI.HHE. ML:1.2 0.000017049999999999998 0.36 AML other m 2021-08-12T23:32:05.68
IV.PIEI.HHN. ML:1.1 0.000012240000000000001 0.5 AML other m 2021-08-12T23:32:07.37
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