Earthquake with magnitude of ML 1.2 on date 17-10-2021 and time 08:42:03 (UTC) in region 4 km NE Spoleto (PG)

A magnitude ML 1.2 earthquake occured in region: 4 km NE Spoleto (PG), on

  • 17-10-2021 08:42:03 (UTC)
  • 17-10-2021 10:42:03 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.771, 12.755 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.

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 4 38218 38218
Campello sul Clitunno PG 6 2442 40660
Sant'Anatolia di Narco PG 8 564 41224
Vallo di Nera PG 9 364 41588
Castel Ritaldi PG 9 3278 44866
Scheggino PG 9 461 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 14 1075 54871
Montefalco PG 16 5679 60550
Giano dell'Umbria PG 16 3846 64396
Poggiodomo PG 16 117 64513
Ferentillo TR 17 1913 66426
Massa Martana PG 19 3770 70196
Acquasparta TR 19 4778 74974
Sellano PG 19 1079 76053
Montefranco TR 19 1276 77329

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km S of Foligno (57155 inhabitants)
25 Km NE of Terni (111501 inhabitants)
48 Km SE of Perugia (166134 inhabitants)
66 Km NE of Viterbo (67173 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
79 Km W of Teramo (54892 inhabitants)
86 Km N of Guidonia Montecelio (88673 inhabitants)
90 Km N of Tivoli (56533 inhabitants)
100 Km N of Roma (2864731 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 earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.2 2021-10-17
08:42:03
42.771 12.7547 11 2021-10-17
08:56:45
Sala Sismica INGV-Roma 96676751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 08:42:03 ± 0.03
Latitude 42.7710 ± 0.0018
Longitude 12.7547 ± 0.0025
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 96676751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 193
Semi-minor axis of confidence ellipse (meter) 185
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 190
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 67
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.45955
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.3
Num. used stations 17
Type of magnitude ML
Reference to an origin 96676751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 08:56:45
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MNTT.EHZ. 2021-10-17T08:42:24.69 3.0 undecidable manual S -3.06 0
IV.CESI.HHZ. 2021-10-17T08:42:13.44 0.3 undecidable manual S 25 0.2581 50 0 74
IV.LNSS.HHZ. 2021-10-17T08:42:13.70 0.3 undecidable manual S 129 0.2689 50 -0.05 74
IV.NRCA.HHZ. 2021-10-17T08:42:13.71 0.3 undecidable manual S 77 0.2707 50 -0.1 73
IV.CSP1.EHZ. 2021-10-17T08:42:12.56 0.3 undecidable manual P 46 0.4596 50 -0.01 72
IV.ATCC.EHZ. 2021-10-17T08:42:11.84 3.0 undecidable manual P -0.25 0
IV.CESX.HHZ. 2021-10-17T08:42:11.79 0.3 undecidable manual S 217 0.2041 50 -0.04 74
IV.ARRO.EHZ. 2021-10-17T08:42:11.62 0.3 undecidable manual S 178 0.1916 50 0.14 73
IV.FDMO.HHZ. 2021-10-17T08:42:11.02 0.3 undecidable manual P 42 0.3597 50 0.15 71
IV.MC2.EHZ. 2021-10-17T08:42:10.79 0.3 undecidable manual P 66 0.348 50 0.13 71
IV.NRCA.HHZ. 2021-10-17T08:42:09.21 0.3 undecidable manual P 77 0.2707 50 -0.13 72
IV.ASSB.HHZ. 2021-10-17T08:42:09.60 0.3 undecidable manual P 346 0.2806 50 0.1 73
IV.CESI.HHZ. 2021-10-17T08:42:09.08 0.1 undecidable manual P 25 0.2581 50 -0.04 99
IV.GAVE.EHZ. 2021-10-17T08:42:09.36 0.3 undecidable manual S 128 0.1295 127 -0.06 76
IV.LNSS.HHZ. 2021-10-17T08:42:09.22 0.1 undecidable manual P 129 0.2689 50 -0.08 98
IV.MOMA.HHZ. 2021-10-17T08:42:09.59 0.3 undecidable manual S 284 0.1394 124 -0.15 74
IT.GNU.HGZ. 2021-10-17T08:42:09.57 0.3 undecidable manual S 284 0.1394 124 -0.17 74
IV.CESX.HHZ. 2021-10-17T08:42:08.30 0.3 undecidable manual P 217 0.2041 50 0.1 74
IV.ARRO.EHZ. 2021-10-17T08:42:07.87 0.6 undecidable manual P 178 0.1916 50 -0.12 49
IV.MOMA.HHZ. 2021-10-17T08:42:07.02 0.3 undecidable manual P 284 0.1394 124 0.03 76
IT.GNU.HGZ. 2021-10-17T08:42:07.21 0.3 undecidable manual P 284 0.1394 124 0.22 73
IV.GAVE.EHZ. 2021-10-17T08:42:06.88 0.1 undecidable manual P 128 0.1295 127 0.08 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MOMA.HHE. ML:1.7 0.000463 0.22 AML other m 2021-10-17T08:42:10.15
IV.GAVE.EHE. ML:1.6 0.00035057055 0.1408 AML other m 2021-10-17T08:42:10.25
IV.GAVE.EHN. ML:1.4 0.000268 0.14 AML other m 2021-10-17T08:42:10.13
IV.MOMA.HHN. ML:1.3 0.00016445795 0.1792 AML other m 2021-10-17T08:42:10.64
IV.LNSS.HHE. ML:1.4 0.000137 1.02 AML other m 2021-10-17T08:42:13.91
IV.LNSS.HHN. ML:1.3 0.00010731254 0.1216 AML other m 2021-10-17T08:42:14.51
IV.ASSB.HHE. ML:1 4.856217E-5 0.0832 AML other m 2021-10-17T08:42:14.65
IV.ASSB.HHN. ML:1.1 5.67E-5 0.16 AML other m 2021-10-17T08:42:14.63
IV.NRCA.HHN. ML:1.1 5.852915E-5 0.1856 AML other m 2021-10-17T08:42:15.11
IV.NRCA.HHE. ML:1.2 7.632199E-5 0.1408 AML other m 2021-10-17T08:42:15.49
IV.GAVE.HNE. ML:1.6 0.00036274195 0.1408 AML other m 2021-10-17T08:42:10.32
IV.MOMA.HNE. ML:1.7 0.00043474875 0.2304 AML other m 2021-10-17T08:42:10.16
IV.MOMA.HNN. ML:1.2 0.00015784455 0.1344 AML other m 2021-10-17T08:42:10.57
IV.CESI.HHE. ML:0.8 2.808713E-5 0.3584 AML other m 2021-10-17T08:42:16.50
IV.CESI.HHN. ML:1 4.679364E-5 0.0832 AML other m 2021-10-17T08:42:13.63
IV.FDMO.HHE. ML:0.9 3.2105995E-5 0.1792 AML other m 2021-10-17T08:42:17.09
IV.FDMO.HHN. ML:0.8 2.114791E-5 0.096 AML other m 2021-10-17T08:42:17.24
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