Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 05-10-2020 and time 12:27:05 (UTC) in region 1 km NE Spoleto (PG)

A magnitude ML 1.7 earthquake occured in region: 1 km NE Spoleto (PG), on

  • 05-10-2020 12:27:05 (UTC)
  • 05-10-2020 14:27:05 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.74, 12.75 at 8 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
Spoleto PG 1 38218 38218
Sant'Anatolia di Narco PG 7 564 38782
Scheggino PG 7 461 39243
Campello sul Clitunno PG 9 2442 41685
Vallo di Nera PG 10 364 42049
Castel Ritaldi PG 11 3278 45327
Ferentillo TR 14 1913 47240
Trevi PG 15 8469 55709
Poggiodomo PG 16 117 55826
Montefranco TR 16 1276 57102
Cerreto di Spoleto PG 16 1075 58177
Arrone TR 17 2763 60940
Acquasparta TR 17 4778 65718
Giano dell'Umbria PG 18 3846 69564
Polino TR 19 233 69797
Massa Martana PG 19 3770 73567
Montefalco PG 19 5679 79246
Monteleone di Spoleto PG 19 599 79845

Municipalities with at least 50000 inhabitants

An earthquake occurred to
22 Km NE of Terni (111501 inhabitants)
24 Km S of Foligno (57155 inhabitants)
50 Km SE of Perugia (166134 inhabitants)
64 Km NE of Viterbo (67173 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
82 Km N of Guidonia Montecelio (88673 inhabitants)
86 Km N of Tivoli (56533 inhabitants)
97 Km N of Roma (2864731 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 1.7 2020-10-05
12:27:05		 42.74 12.75 8 2020-10-05
12:35:01		 Sala Sismica INGV-Roma 83524571
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-05 12:27:05 ± 0.04
Latitude 42.74 ± 0.00
Longitude 12.75 ± 0.00
Depth (km) 8 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 83524571

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 196
Semi-minor axis of confidence ellipse (meter) 183
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 4
Circular confidence region, given by single value of horizontal uncertainty (meter) 200
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 30
Number of defining phases 27
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.54409
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 83524571
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-05 12:35:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.IMOL.HNZ. 2020-10-05T12:27:31.35 3.0 positive manual Pn 0.35 0
IV.FIAM.HHZ. 2020-10-05T12:27:24.37 0.6 undecidable manual S 150 0.5441 50 0.07 46
IV.CSP1.EHZ. 2020-10-05T12:27:22.70 0.3 undecidable manual S 43 0.4847 50 0.16 69
IV.SMA1.EHZ. 2020-10-05T12:27:21.67 0.3 undecidable manual S 104 0.4443 50 0.33 67
IV.RM33.EHZ. 2020-10-05T12:27:20.34 0.1 undecidable manual S 124 0.4128 50 -0.07 95
IV.MC2.EHZ. 2020-10-05T12:27:19.24 0.3 undecidable manual S 62 0.3651 50 0.24 69
IV.FDMO.HHZ. 2020-10-05T12:27:19.59 0.3 undecidable manual S 40 0.3858 50 -0.04 72
IV.PE3.EHZ. 2020-10-05T12:27:18.75 3.0 negative manual P -0.82 0
IV.ASSB.HHN. 2020-10-05T12:27:17.27 0.3 undecidable manual S 348 0.3094 103 -0.04 73
IV.NRCA.HHZ. 2020-10-05T12:27:16.20 0.3 undecidable manual S 71 0.2833 104 -0.12 72
IV.CESI.HHZ. 2020-10-05T12:27:16.56 0.3 undecidable manual S 23 0.2878 104 0.06 73
IV.FIAM.HHZ. 2020-10-05T12:27:15.80 0.1 undecidable manual P 150 0.5441 50 -0.37 87
IV.CSP1.EHZ. 2020-10-05T12:27:15.07 0.1 undecidable manual P 43 0.4847 50 -0.08 93
IV.LNSS.HHZ. 2020-10-05T12:27:15.10 0.3 undecidable manual S 123 0.2536 106 -0.12 73
IV.SMA1.EHZ. 2020-10-05T12:27:14.40 0.1 undecidable manual P 104 0.4443 50 -0.06 94
IV.ARVD.HHZ. 2020-10-05T12:27:14.26 3.0 undecidable manual P -1.47 0
IV.MC2.EHZ. 2020-10-05T12:27:13.02 0.1 undecidable manual P 62 0.3651 50 -0.09 95
IV.FDMO.HHZ. 2020-10-05T12:27:13.45 0.1 undecidable manual P 40 0.3858 50 -0.02 96
IV.RM33.EHZ. 2020-10-05T12:27:13.99 0.1 undecidable manual P 124 0.4128 50 0.07 95
IV.ASSB.HHN. 2020-10-05T12:27:12.17 0.1 undecidable manual P 348 0.3094 103 0.04 97
IV.CESX.HHZ. 2020-10-05T12:27:12.45 0.3 undecidable manual S 222 0.1781 112 0.01 75
IV.MOMA.HHZ. 2020-10-05T12:27:11.36 0.3 undecidable manual S 296 0.1466 116 0.02 76
IV.NRCA.HHZ. 2020-10-05T12:27:11.36 0.1 undecidable manual P 71 0.2833 104 -0.2 95
IV.CESI.HHZ. 2020-10-05T12:27:11.57 0.1 undecidable manual P 23 0.2878 104 -0.09 97
IV.GAVE.EHZ. 2020-10-05T12:27:10.56 0.3 undecidable manual S 114 0.116 122 0.22 73
IV.LNSS.HHZ. 2020-10-05T12:27:10.74 0.1 undecidable manual P 123 0.2536 106 -0.19 95
IV.CESX.HHZ. 2020-10-05T12:27:09.29 0.1 undecidable manual P 222 0.1781 112 -0.03 100
IV.ARRO.EHZ. 2020-10-05T12:27:09.20 0.1 undecidable manual P 176 0.161 114 0.22 97
IV.GAVE.EHZ. 2020-10-05T12:27:08.26 0.1 negative manual P 114 0.116 122 0.16 99
IV.MOMA.HHZ. 2020-10-05T12:27:08.76 0.1 negative manual P 296 0.1466 116 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.9 0.0008525 0.84 AML other m 2020-10-05T12:27:11.45
IV.GAVE.EHE. ML:1.9 0.0009495 0.22 AML other m 2020-10-05T12:27:12.41
IV.MOMA.HNE. ML:1.6 0.0003445 0.62 AML other m 2020-10-05T12:27:12.47
IV.MOMA.HHE. ML:1.6 0.00036 0.62 AML other m 2020-10-05T12:27:12.47
IV.MOMA.HHN. ML:1.6 0.000372 0.26 AML other m 2020-10-05T12:27:12.69
IV.CESX.HHN. ML:1.7 0.000409 1.58 AML other m 2020-10-05T12:27:14.09
IV.CESX.HHE. ML:1.8 0.000562 0.66 AML other m 2020-10-05T12:27:14.38
IV.NRCA.HHN. ML:1.7 0.0002415 0.12 AML other m 2020-10-05T12:27:16.84
IV.NRCA.HHE. ML:1.6 0.000188 0.42 AML other m 2020-10-05T12:27:17.55
IV.CESI.HHE. ML:1.6 0.000163 0.6 AML other m 2020-10-05T12:27:17.86
IV.CESI.HHN. ML:1.6 0.0001905 0.38 AML other m 2020-10-05T12:27:17.70
IV.LNSS.HHN. ML:1.9 0.0004045 0.34 AML other m 2020-10-05T12:27:17.88
IV.LNSS.HHE. ML:1.9 0.00041 0.26 AML other m 2020-10-05T12:27:17.76
IV.MOMA.HNN. ML:1.9 0.0008395 0.9 AML other m 2020-10-05T12:27:19.99
IV.FDMO.HHE. ML:1.6 0.0001195 1.04 AML other m 2020-10-05T12:27:21.24
IV.FDMO.HHN. ML:1.3 6.925E-5 0.4 AML other m 2020-10-05T12:27:23.03
IV.CSP1.EHE. ML:2.1 0.0003005 0.26 AML other m 2020-10-05T12:27:23.45
IV.CSP1.EHN. ML:2.1 0.000276 0.64 AML other m 2020-10-05T12:27:23.55
IV.IMOL.HNN. ML:3.6 0.001231 0.48 AML other m 2020-10-05T12:27:57.63
IV.IMOL.HNE. ML:3.5 0.0009865 0.08 AML other m 2020-10-05T12:27:57.88
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