Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 26-10-2021 and time 04:00:17 (UTC) in region 5 km W Terni (TR)

A magnitude ML 1.6 earthquake occured in region: 5 km W Terni (TR), on

  • 26-10-2021 04:00:17 (UTC)
  • 26-10-2021 06:00:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.5600, 12.5810 at 6 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 6 111501 111501
San Gemini TR 7 5018 116519
Narni TR 7 19785 136304
Stroncone TR 10 4917 141221
Montecastrilli TR 13 5022 146243
Amelia TR 14 11897 158140
Acquasparta TR 15 4778 162918
Arrone TR 16 2763 165681
Configni RI 16 633 166314
Montefranco TR 16 1276 167590
Avigliano Umbro TR 16 2558 170148
Otricoli TR 17 1869 172017
Calvi dell'Umbria TR 18 1856 173873
Colli sul Velino RI 18 533 174406
Labro RI 18 374 174780
Ferentillo TR 19 1913 176693
Cottanello RI 19 563 177256
Orte VT 19 8923 186179
Greccio RI 20 1558 187737
Vacone RI 20 256 187993
Penna in Teverina TR 20 1099 189092

Municipalities with at least 50000 inhabitants

An earthquake occurred to
6 Km W of Terni (111501 inhabitants)
42 Km E of Viterbo (67173 inhabitants)
45 Km S of Foligno (57155 inhabitants)
63 Km S of Perugia (166134 inhabitants)
63 Km N of Guidonia Montecelio (88673 inhabitants)
69 Km N of Tivoli (56533 inhabitants)
71 Km W of L'Aquila (69753 inhabitants)
75 Km N of Roma (2864731 inhabitants)
83 Km NE of Civitavecchia (52991 inhabitants)
92 Km NE of Fiumicino (78395 inhabitants)
93 Km W of Teramo (54892 inhabitants)
98 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 1.6 2021-10-26
04:00:17		 42.5603 12.5808 6 2022-03-30
13:04:40		 Bollettino Sismico Italiano INGV 101589641
Reviewed
Rev100 		ML 1.6 2021-10-26
04:00:17		 42.5552 12.5898 7 2021-10-26
04:13:41		 Sala Sismica INGV-Roma 96993061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 04:00:17 ± 0.07
Latitude 42.5603 ± 0.0036
Longitude 12.5808 ± 0.0049
Depth (km) 6 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 101589641

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 307
Semi-minor axis of confidence ellipse (meter) 252
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 313
Circular confidence region, given by single value of horizontal uncertainty (meter) 330.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 44
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.85795
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 22
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 101589641
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2022-03-01 18:00:25

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 96993061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 04:13:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
MN.TRI.HHZ. 2021-10-26T04:01:59.08 3.0 undecidable manual Sg 8.43 0
IV.CDRU.HHZ. 2021-10-26T04:01:46.20 3.0 undecidable manual Sg 1.66 0
IX.NSC3.EHZ.02 2021-10-26T04:01:39.90 3.0 undecidable manual Sg 4.05 0
IV.SBPO.HNZ. 2021-10-26T04:01:07.83 3.0 negative manual Pg 2.85 0
IV.BRSN.EHZ. 2021-10-26T04:00:51.85 3.0 positive manual Pg 0.98 0
IV.ATCC.EHZ. 2021-10-26T04:00:39.93 0.6 undecidable manual S 4 69.4749 50 0.68 40
IV.MML1.EHZ. 2021-10-26T04:00:39.85 0.6 undecidable manual S 27 69.0753 50 0.7 40
IV.SACS.HHZ. 2021-10-26T04:00:38.00 0.3 undecidable manual S 301 63.3921 50 0.37 67
IV.MC2.EHZ. 2021-10-26T04:00:37.89 0.6 undecidable manual S 52 62.9925 50 0.36 45
IV.T1299.HNN. 2021-10-26T04:00:36.68 0.6 undecidable manual S 82 57.8976 50 0.53 43
IV.FEMA.HNE. 2021-10-26T04:00:36.45 0.6 undecidable manual S 40 58.6968 50 0.08 48
IV.GIUL.HHZ. 2021-10-26T04:00:36.85 3.0 negative manual P -6.62 0
IT.MTCL.HGZ. 2021-10-26T04:00:36.52 0.6 undecidable manual S 35 58.9965 50 0.08 48
IV.CESI.HHZ. 2021-10-26T04:00:35.60 0.3 undecidable manual S 28 55.8996 50 -0.03 73
IV.BARO.EHZ. 2021-10-26T04:00:35.87 0.6 undecidable manual S 232 55.5 50 0.35 46
IV.NRCA.HHZ. 2021-10-26T04:00:34.61 0.6 undecidable manual S 55 53.0025 50 -0.24 47
IV.MGAB.HHZ. 2021-10-26T04:00:34.90 0.3 undecidable manual S 316 54.6009 50 -0.39 68
IV.RM33.HNE. 2021-10-26T04:00:34.81 0.6 undecidable manual S 96 52.1034 50 0.2 48
IV.MF5.EHZ. 2021-10-26T04:00:33.05 0.3 undecidable manual P 56 85.8474 50 0.59 60
IV.EL6.EHZ. 2021-10-26T04:00:33.77 0.3 undecidable manual P 26 95.238 50 -0.13 67
IV.CSP1.EHZ. 2021-10-26T04:00:31.11 0.3 undecidable manual P 41 77.7666 50 -0.11 69
IV.SRES.HHZ. 2021-10-26T04:00:30.00 0.6 undecidable manual S 189 36.3414 100 0 51
IV.LNSS.HHZ. 2021-10-26T04:00:30.42 0.3 undecidable manual S 83 37.8288 100 -0.09 75
IV.ATCC.EHZ. 2021-10-26T04:00:29.95 0.6 undecidable manual P 4 69.4749 50 0.02 48
IV.MML1.EHZ. 2021-10-26T04:00:29.55 0.3 undecidable manual P 27 69.0753 50 -0.33 67
IV.MMO1.EHZ. 2021-10-26T04:00:29.96 0.3 undecidable manual P 58 71.4729 50 -0.28 68
IV.SACS.HHZ. 2021-10-26T04:00:28.90 0.3 undecidable manual P 301 63.3921 50 -0.1 71
IT.MTCL.HGZ. 2021-10-26T04:00:28.10 0.3 undecidable manual P 35 58.9965 50 -0.21 70
IV.SMA1.EHZ. 2021-10-26T04:00:28.76 0.3 undecidable manual P 83 62.0934 50 -0.04 72
IV.FIAM.HHZ. 2021-10-26T04:00:28.11 0.6 undecidable manual P 126 54.6009 50 0.47 45
IV.T1299.HNN. 2021-10-26T04:00:28.05 0.1 undecidable manual P 82 57.8976 50 -0.09 96
IV.MC2.EHZ. 2021-10-26T04:00:28.96 0.3 undecidable manual P 52 62.9925 50 0.02 72
IV.FEMA.HNE. 2021-10-26T04:00:28.02 0.3 undecidable manual P 40 58.6968 50 -0.25 70
IV.CESI.HHZ. 2021-10-26T04:00:27.48 0.3 undecidable manual P 28 55.8996 50 -0.36 68
IV.BARO.EHZ. 2021-10-26T04:00:27.69 0.3 undecidable manual P 232 55.5 50 -0.09 72
IV.RM33.HNE. 2021-10-26T04:00:27.08 0.1 undecidable manual P 96 52.1034 50 -0.17 95
IV.NRCA.HHZ. 2021-10-26T04:00:27.06 0.3 undecidable manual P 55 53.0025 50 -0.34 69
IV.MGAB.HHZ. 2021-10-26T04:00:27.42 0.3 undecidable manual P 316 54.6009 50 -0.23 70
IT.GNU.HGE. 2021-10-26T04:00:26.76 0.6 undecidable manual S 358 27.0507 103 -0.08 51
IV.SRES.HHZ. 2021-10-26T04:00:24.63 0.3 undecidable manual P 189 36.3414 100 0.03 76
IV.LNSS.HHZ. 2021-10-26T04:00:24.79 0.1 undecidable manual P 83 37.8288 100 -0.1 99
IT.GNU.HGE. 2021-10-26T04:00:22.72 0.3 undecidable manual P 358 27.0507 103 -0.05 77
IV.CESX.HHZ. 2021-10-26T04:00:20.26 0.3 undecidable manual S 5 5.3946 140 0.16 78
IV.CESX.HHZ. 2021-10-26T04:00:19.22 0.1 undecidable manual P 5 5.3946 140 0.34 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HNN. ML:1.8 0.00025781325 0.8384 AML other m 2021-10-26T04:00:25.59
IV.MGAB.HNE. ML:1.7 0.00011438719999999999 1.3984 AML other m 2021-10-26T04:00:29.05
IV.SRES.HHE. ML:1.4 0.00010159999999999999 0.26 AML other m 2021-10-26T04:00:30.80
IV.SRES.HHN. ML:1.0 0.00004356743 0.1376 AML other m 2021-10-26T04:00:31.37
IV.LNSS.HHN. ML:1.6 0.000135492335 0.1376 AML other m 2021-10-26T04:00:32.23
IV.LNSS.HHE. ML:1.7 0.0001775395 0.0992 AML other m 2021-10-26T04:00:32.77
IV.LNSS.HNE. ML:1.6 0.00016531589 0.1408 AML other m 2021-10-26T04:00:32.78
IV.NRCA.HHE. ML:1.7 0.0001255 0.74 AML other m 2021-10-26T04:00:36.02
IV.MGAB.HHN. ML:1.6 0.0001046 0.18 AML other m 2021-10-26T04:00:36.52
IV.NRCA.HHN. ML:1.7 0.00011707044999999999 0.0992 AML other m 2021-10-26T04:00:36.98
IV.NRCA.HNE. ML:1.7 0.0001327887 0.1696 AML other m 2021-10-26T04:00:37.19
IV.CESI.HHN. ML:1.5 0.00007230000000000001 0.7 AML other m 2021-10-26T04:00:37.20
IV.CESI.HHE. ML:1.2 0.000035073430000000004 0.1024 AML other m 2021-10-26T04:00:37.31
IV.MGAB.HHE. ML:1.6 0.00008915000000000001 1.84 AML other m 2021-10-26T04:00:37.96
IV.NRCA.HNN. ML:1.8 0.00014216105 0.5216 AML other m 2021-10-26T04:00:44.22
IV.MGAB.HNN. ML:1.9 0.00017711325 0.8 AML other m 2021-10-26T04:00:45.11
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