Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 24-01-2021 and time 23:34:46 (Italy) in region 5 km NE Cerreto di Spoleto (PG)

A magnitude ML 1.1 earthquake occured in region: 5 km NE Cerreto di Spoleto (PG), on

  • 24-01-2021 22:34:46 (UTC)
  • 24-01-2021 23:34:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.85, 12.97 at 11 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.

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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
Cerreto di Spoleto PG 5 1075 1075
Sellano PG 6 1079 2154
Preci PG 7 724 2878
Norcia PG 12 4957 7835
Vallo di Nera PG 12 364 8199
Visso MC 14 1107 9306
Cascia PG 15 3217 12523
Poggiodomo PG 15 117 12640
Castelsantangelo sul Nera MC 16 281 12921
Campello sul Clitunno PG 16 2442 15363
Monte Cavallo MC 17 145 15508
Sant'Anatolia di Narco PG 17 564 16072
Ussita MC 18 444 16516
Trevi PG 18 8469 24985
Scheggino PG 19 461 25446

Municipalities with at least 50000 inhabitants

An earthquake occurred to
25 Km E of Foligno (57155 inhabitants)
41 Km NE of Terni (111501 inhabitants)
56 Km SE of Perugia (166134 inhabitants)
64 Km W of Teramo (54892 inhabitants)
65 Km NW of L'Aquila (69753 inhabitants)
85 Km NE of Viterbo (67173 inhabitants)
96 Km N of Guidonia Montecelio (88673 inhabitants)
97 Km SW of Ancona (100861 inhabitants)
99 Km N of Tivoli (56533 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 1.1 2021-01-24
22:34:46		 42.85 12.97 11 2021-01-24
23:35:49		 Sala Sismica INGV-Roma 86546741
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-24 22:34:46 ± 0.03
Latitude 42.85 ± 0.00
Longitude 12.97 ± 0.00
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86546741

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 240
Semi-minor axis of confidence ellipse (meter) 161
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 92
Circular confidence region, given by single value of horizontal uncertainty (meter) 240
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.10612
Epicentral distance of station farthest from the epicenter (degree) 0.30037
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 86546741
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-24 23:35:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MOMA.HHZ. 2021-01-24T22:34:57.46 0.3 undecidable manual S 262 0.2968 50 0.03 73
IV.ASSB.HHE. 2021-01-24T22:34:57.35 0.3 undecidable manual S 311 0.3004 50 -0.2 70
IV.MMO1.EHZ. 2021-01-24T22:34:56.55 0.3 undecidable manual S 78 0.2662 50 0.03 73
IV.LNSS.HHZ. 2021-01-24T22:34:55.86 0.3 undecidable manual S 168 0.2491 50 -0.15 72
IV.FDMO.HHZ. 2021-01-24T22:34:54.72 0.3 undecidable manual S 24 0.2077 50 -0.08 73
IV.GAVE.EHZ. 2021-01-24T22:34:53.31 0.3 undecidable manual S 200 0.1646 121 -0.14 73
IV.CESI.HHZ. 2021-01-24T22:34:53.35 0.3 undecidable manual S 343 0.1655 120 -0.14 73
IV.ASSB.HHE. 2021-01-24T22:34:53.16 0.6 undecidable manual P 311 0.3004 50 0.44 44
IV.FEMA.HNZ. 2021-01-24T22:34:52.31 0.3 undecidable manual S 27 0.1286 127 -0.01 75
IV.MMO1.EHZ. 2021-01-24T22:34:52.15 0.1 undecidable manual P 78 0.2662 50 0.03 98
IV.MOMA.HHZ. 2021-01-24T22:34:52.89 0.6 undecidable manual P 262 0.2968 50 0.25 46
IT.MTCL.HGZ. 2021-01-24T22:34:52.78 0.3 undecidable manual S 8 0.1484 123 -0.16 73
IV.NRCA.HHZ. 2021-01-24T22:34:51.58 0.3 undecidable manual S 97 0.1061 132 -0.06 75
IV.FDMO.HHZ. 2021-01-24T22:34:51.13 0.1 undecidable manual P 24 0.2077 50 0.01 99
IV.LNSS.HHZ. 2021-01-24T22:34:51.75 0.1 undecidable manual P 168 0.2491 50 -0.08 97
IV.CESI.HHZ. 2021-01-24T22:34:50.43 0.1 undecidable manual P 343 0.1655 120 0.06 99
IT.MTCL.HGZ. 2021-01-24T22:34:50.08 0.1 undecidable manual P 8 0.1484 123 0.02 100
IV.GAVE.EHZ. 2021-01-24T22:34:50.42 0.1 undecidable manual P 200 0.1646 121 0.07 99
IV.FEMA.HNZ. 2021-01-24T22:34:49.85 0.3 undecidable manual P 27 0.1286 127 0.15 73
IV.NRCA.HHZ. 2021-01-24T22:34:49.45 0.1 undecidable manual P 97 0.1061 132 0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.5 0.0003585 0.08 AML other m 2021-01-24T22:34:51.68
IV.NRCA.HHE. ML:1.2 0.00018139505 0.0896 AML other m 2021-01-24T22:34:51.85
IV.NRCA.HNE. ML:1.2 0.00018385964 0.1024 AML other m 2021-01-24T22:34:51.80
IV.NRCA.HNN. ML:1.5 0.00034104905 0.0896 AML other m 2021-01-24T22:34:51.69
IV.GAVE.EHE. ML:1.3 0.00015814615 0.2048 AML other m 2021-01-24T22:34:53.66
IV.GAVE.EHN. ML:1 8.472315E-5 0.2176 AML other m 2021-01-24T22:34:53.74
IV.GAVE.HNE. ML:1.3 0.000160470615 0.2048 AML other m 2021-01-24T22:34:53.56
IV.CESI.HHE. ML:0.8 5.051392E-5 0.1024 AML other m 2021-01-24T22:34:53.57
IV.CESI.HHN. ML:1.1 9.103119E-5 0.1408 AML other m 2021-01-24T22:34:53.58
IV.CESI.HNN. ML:1 8.2164065E-5 0.128 AML other m 2021-01-24T22:34:53.64
IV.FDMO.HHE. ML:1 5.8476825E-5 0.1152 AML other m 2021-01-24T22:34:55.66
IV.FDMO.HHN. ML:0.8 3.63835879E-5 0.1408 AML other m 2021-01-24T22:34:55.14
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