Earthquake with magnitude of ML 1.2 on date 24-02-2021 and time 00:02:00 (Italy) in region 2 km W Terni (TR)

A magnitude ML 1.2 earthquake occured in region: 2 km W Terni (TR), on

  • 23-02-2021 23:02:00 (UTC)
  • 24-02-2021 00:02:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.57, 12.62 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.

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 2 111501 111501
San Gemini TR 8 5018 116519
Stroncone TR 8 4917 121436
Narni TR 10 19785 141221
Arrone TR 12 2763 143984
Montefranco TR 13 1276 145260
Montecastrilli TR 14 5022 150282
Acquasparta TR 15 4778 155060
Colli sul Velino RI 15 533 155593
Ferentillo TR 15 1913 157506
Labro RI 15 374 157880
Configni RI 16 633 158513
Amelia TR 17 11897 170410
Greccio RI 18 1558 171968
Morro Reatino RI 18 373 172341
Polino TR 18 233 172574
Avigliano Umbro TR 19 2558 175132
Cottanello RI 19 563 175695
Calvi dell'Umbria TR 19 1856 177551
Otricoli TR 20 1869 179420

Municipalities with at least 50000 inhabitants

An earthquake occurred to
2 Km W of Terni (111501 inhabitants)
44 Km S of Foligno (57155 inhabitants)
45 Km E of Viterbo (67173 inhabitants)
63 Km SE of Perugia (166134 inhabitants)
64 Km N of Guidonia Montecelio (88673 inhabitants)
68 Km W of L'Aquila (69753 inhabitants)
69 Km N of Tivoli (56533 inhabitants)
76 Km N of Roma (2864731 inhabitants)
86 Km NE of Civitavecchia (52991 inhabitants)
89 Km W of Teramo (54892 inhabitants)
94 Km NE of Fiumicino (78395 inhabitants)
99 Km N of Velletri (53303 inhabitants)
100 Km N of Pomezia (62966 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.2 2021-02-23
23:02:00
42.57 12.62 10 2021-02-23
23:11:23
Sala Sismica INGV-Roma 87422051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-23 23:02:00 ± 0.15
Latitude 42.57 ± 0.01
Longitude 12.62 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 87422051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 948
Semi-minor axis of confidence ellipse (meter) 540
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 110
Circular confidence region, given by single value of horizontal uncertainty (meter) 950
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 134
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34084
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.1
Num. used stations 8
Type of magnitude ML
Reference to an origin 87422051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-23 23:11:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SRES.HHE. 2021-02-23T23:02:13.04 0.6 undecidable manual S 194 0.3408 50 -0.25 49
IT.MMP1.HGN. 2021-02-23T23:02:13.84 0.6 undecidable manual S 164 0.3318 50 0.81 40
IV.LNSS.HNN. 2021-02-23T23:02:12.10 0.6 undecidable manual S 83 0.3103 50 -0.29 50
IV.MOMA.HHZ. 2021-02-23T23:02:10.37 0.6 undecidable manual S 351 0.2392 110 0.19 50
IV.GAVE.EHZ. 2021-02-23T23:02:10.15 0.6 undecidable manual S 58 0.2365 110 0.06 52
IT.MMP1.HGN. 2021-02-23T23:02:07.89 0.1 undecidable manual P 164 0.3318 50 0.2 99
IV.LNSS.HNN. 2021-02-23T23:02:07.11 0.1 undecidable manual P 83 0.3103 50 -0.21 100
IV.SRES.HHE. 2021-02-23T23:02:07.47 0.1 undecidable manual P 194 0.3408 50 -0.37 96
IV.MOMA.HHZ. 2021-02-23T23:02:06.15 0.6 negative manual P 351 0.2392 110 0.1 51
IV.GAVE.EHZ. 2021-02-23T23:02:06.56 0.6 undecidable manual P 58 0.2365 110 0.57 46
IV.ARRO.EHZ. 2021-02-23T23:02:05.63 0.6 undecidable manual S 84 0.107 129 -0.06 52
IV.ARRO.EHZ. 2021-02-23T23:02:03.50 0.3 negative manual P 84 0.107 129 0.04 80
IV.CESX.HHZ. 2021-02-23T23:02:02.66 0.6 positive manual P 328 0.0477 151 0.07 54
IV.LAV9.HHZ. 2021-02-23T23:01:57.07 3.0 undecidable manual P 0 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESX.HHN. ML:1.2 0.0002685 0.36 AML other m 2021-02-23T23:02:04.51
IV.ARRO.EHN. ML:1.3 0.0002415 0.24 AML other m 2021-02-23T23:02:05.84
IV.ARRO.EHE. ML:1.3 0.000233 0.22 AML other m 2021-02-23T23:02:08.68
IV.CESX.HHE. ML:1 0.000188 0.36 AML other m 2021-02-23T23:02:11.82
IV.MOMA.HHN. ML:1.2 8.135E-5 0.2 AML other m 2021-02-23T23:02:12.44
IV.MOMA.HHE. ML:1.2 8.965E-5 0.82 AML other m 2021-02-23T23:02:12.49
IV.GAVE.EHN. ML:1.1 6.94E-5 0.48 AML other m 2021-02-23T23:02:13.05
IV.GAVE.EHE. ML:1.1 6.57E-5 1.4 AML other m 2021-02-23T23:02:14.10
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download