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) 42.555, 12.59 at 7 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.

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
Narni TR 7 19785 131286
San Gemini TR 7 5018 136304
Stroncone TR 9 4917 141221
Montecastrilli TR 14 5022 146243
Amelia TR 15 11897 158140
Arrone TR 15 2763 160903
Configni RI 15 633 161536
Montefranco TR 15 1276 162812
Acquasparta TR 16 4778 167590
Colli sul Velino RI 17 533 168123
Calvi dell'Umbria TR 17 1856 169979
Otricoli TR 17 1869 171848
Avigliano Umbro TR 17 2558 174406
Labro RI 18 374 174780
Ferentillo TR 18 1913 176693
Cottanello RI 18 563 177256
Greccio RI 19 1558 178814
Vacone RI 19 256 179070
Orte VT 20 8923 187993

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km W of Terni (111501 inhabitants)
43 Km E of Viterbo (67173 inhabitants)
46 Km S of Foligno (57155 inhabitants)
63 Km N of Guidonia Montecelio (88673 inhabitants)
64 Km S of Perugia (166134 inhabitants)
68 Km N of Tivoli (56533 inhabitants)
70 Km W of L'Aquila (69753 inhabitants)
74 Km N of Roma (2864731 inhabitants)
83 Km NE of Civitavecchia (52991 inhabitants)
92 Km NE of Fiumicino (78395 inhabitants)
92 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
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
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 ± 0.08
Latitude 42.5552 ± 0.0036
Longitude 12.5898 ± 0.0049
Depth (km) 7 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96993061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 449
Semi-minor axis of confidence ellipse (meter) 229
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 138
Circular confidence region, given by single value of horizontal uncertainty (meter) 450
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 109
Number of associated phases, regardless of their use for origin computation 36
Number of defining phases 23
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
Epicentral distance of station farthest from the epicenter (degree) 0.70057
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 12
Magnitude information

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 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.EL6.EHZ. 2021-10-26T04:00:47.60 3.0 undecidable manual S -0.89 0
IV.MML1.EHZ. 2021-10-26T04:00:39.75 0.6 undecidable manual S 27 0.6241 50 0.55 41
IV.ATCC.EHZ. 2021-10-26T04:00:39.96 0.3 undecidable manual S 3 0.6304 50 0.57 61
IV.SACS.HHZ. 2021-10-26T04:00:38.07 0.3 undecidable manual S 301 0.5792 50 0.2 67
IV.MC2.EHZ. 2021-10-26T04:00:37.76 0.6 undecidable manual S 51 0.5657 50 0.29 44
IV.BARO.EHZ. 2021-10-26T04:00:36.00 0.6 undecidable manual S 232 0.5018 50 0.42 44
IV.GIUL.HHZ. 2021-10-26T04:00:36.85 3.0 negative manual P -6.62 0
IV.FIAM.HHZ. 2021-10-26T04:00:36.15 3.0 undecidable manual S 0.4838 1.12 0
IV.CESI.HHZ. 2021-10-26T04:00:35.60 0.3 undecidable manual S 27 0.5054 50 -0.08 70
IV.MGAB.HHZ. 2021-10-26T04:00:35.07 0.3 undecidable manual S 316 0.5009 50 -0.46 65
IV.NRCA.HHZ. 2021-10-26T04:00:34.61 0.6 undecidable manual S 54 0.4748 50 -0.17 46
IV.MF5.EHZ. 2021-10-26T04:00:33.12 3.0 positive manual P -1.21 0
IV.MNTT.EHZ. 2021-10-26T04:00:32.98 3.0 negative manual P -3.65 0
IV.CSP1.EHZ. 2021-10-26T04:00:31.11 0.3 undecidable manual P 40 0.7006 50 -0.12 67
IV.SRES.HHZ. 2021-10-26T04:00:30.00 0.6 undecidable manual S 191 0.3238 100 0.08 49
IV.ATCC.EHZ. 2021-10-26T04:00:30.07 1.0 undecidable manual P 3 0.6304 50 0.04 23
IV.LNSS.HHZ. 2021-10-26T04:00:30.42 0.3 undecidable manual S 82 0.3345 100 0.06 73
IV.SACS.HHZ. 2021-10-26T04:00:29.24 0.3 undecidable manual P 301 0.5792 50 0.08 69
IV.MML1.EHZ. 2021-10-26T04:00:29.82 0.3 undecidable manual P 27 0.6241 50 -0.11 68
IV.MMO1.EHZ. 2021-10-26T04:00:29.96 3.0 negative manual P -1.75 0
IV.MC2.EHZ. 2021-10-26T04:00:29.01 1.0 positive manual P 51 0.5657 50 0.08 23
IV.FIAM.HHZ. 2021-10-26T04:00:28.55 3.0 undecidable manual P 0.4838 1.03 0
IV.SMA1.EHZ. 2021-10-26T04:00:28.88 3.0 positive manual P -1.53 0
IV.NRCA.HHZ. 2021-10-26T04:00:27.06 0.3 undecidable manual P 54 0.4748 50 -0.32 67
IV.MGAB.HHZ. 2021-10-26T04:00:27.47 1.0 positive manual P 316 0.5009 50 -0.34 22
IV.CESI.HHZ. 2021-10-26T04:00:27.53 0.1 undecidable manual P 27 0.5054 50 -0.36 88
IV.BARO.EHZ. 2021-10-26T04:00:27.64 0.1 undecidable manual P 232 0.5018 50 -0.2 91
IV.SRES.HHZ. 2021-10-26T04:00:24.63 0.3 undecidable manual P 191 0.3238 100 0.06 73
IV.LNSS.HHZ. 2021-10-26T04:00:24.88 0.6 positive manual P 82 0.3345 100 0.06 49
IV.CESX.HHZ. 2021-10-26T04:00:20.26 0.3 undecidable manual S 358 0.0531 138 -0.08 77
IV.CESX.HHZ. 2021-10-26T04:00:19.22 0.1 undecidable manual P 358 0.0531 138 0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SRES.HHE. ML:1.4 0.0001016 0.26 AML other m 2021-10-26T04:00:30.80
IV.LNSS.HHN. ML:1.5 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.SRES.HHN. ML:1 4.356743E-5 0.1376 AML other m 2021-10-26T04:00:31.37
IV.NRCA.HHE. ML:1.7 0.0001255 0.74 AML other m 2021-10-26T04:00:36.02
IV.MGAB.HHN. ML:1.7 0.0001046 0.18 AML other m 2021-10-26T04:00:36.52
IV.NRCA.HHN. ML:1.7 0.00011707045 0.0992 AML other m 2021-10-26T04:00:36.98
IV.CESI.HHN. ML:1.5 7.23E-5 0.7 AML other m 2021-10-26T04:00:37.20
IV.CESI.HHE. ML:1.2 3.507343E-5 0.1024 AML other m 2021-10-26T04:00:37.31
IV.MGAB.HHE. ML:1.6 8.915E-5 1.84 AML other m 2021-10-26T04:00:37.96
IV.CESX.HHE. ML:0 0.001195064 0.32 AML other m 2021-10-26T04:00:20.54
IV.LNSS.HNE. ML:1.6 0.00016531589 0.1408 AML other m 2021-10-26T04:00:32.78
IV.LNSS.HNN. ML:1.8 0.00025781325 1.1616 AML other m 2021-10-26T04:00:24.59
IV.NRCA.HNE. ML:1.7 0.0001327887 0.1696 AML other m 2021-10-26T04:00:37.19
IV.NRCA.HNN. ML:1.8 0.00014216105 0.5216 AML other m 2021-10-26T04:00:44.22
IV.MGAB.HNE. ML:1.7 0.0001143872 0.6016 AML other m 2021-10-26T04:00:29.05
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