Earthquake with magnitude of ML 1.2 on date 17-10-2021 and time 05:07:51 (UTC) in region 4 km N Spoleto (PG)

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

  • 17-10-2021 05:07:51 (UTC)
  • 17-10-2021 07:07:51 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.771, 12.754 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
Castel Ritaldi PG 9 3278 44502
Vallo di Nera PG 9 364 44866
Scheggino PG 9 461 45327
Trevi PG 12 8469 53796
Cerreto di Spoleto PG 14 1075 54871
Giano dell'Umbria PG 16 3846 58717
Montefalco PG 16 5679 64396
Poggiodomo PG 16 117 64513
Ferentillo TR 17 1913 66426
Massa Martana PG 19 3770 70196
Acquasparta TR 19 4778 74974
Montefranco TR 19 1276 76250
Sellano PG 19 1079 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)
71 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
05:07:51
42.7712 12.7538 11 2021-10-17
05:13:26
Sala Sismica INGV-Roma 96672061
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 05:07:51 ± 0.04
Latitude 42.7712 ± 0.0027
Longitude 12.7538 ± 0.0037
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 96672061

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 325
Semi-minor axis of confidence ellipse (meter) 257
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 227
Circular confidence region, given by single value of horizontal uncertainty (meter) 320
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 21
Number of defining phases 18
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
Epicentral distance of station farthest from the epicenter (degree) 0.37772
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 9
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 96672061
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 05:13:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-10-17T05:08:13.05 3.0 undecidable manual S -0.18 0
IV.MML1.EHZ. 2021-10-17T05:08:05.44 0.6 undecidable manual S 25 0.3777 50 0.42 44
IV.MC2.EHZ. 2021-10-17T05:08:04.39 3.0 undecidable manual S -0.15 0
IV.ASSB.HHZ. 2021-10-17T05:08:02.22 0.6 undecidable manual S 346 0.2797 50 0.09 48
IV.NRCA.HHZ. 2021-10-17T05:08:01.80 0.6 undecidable manual S 77 0.2716 50 -0.08 48
IV.LNSS.HHZ. 2021-10-17T05:08:01.90 0.6 undecidable manual S 129 0.2698 50 0.09 49
IV.CESI.HHZ. 2021-10-17T05:08:01.34 0.6 undecidable manual S 25 0.2581 50 -0.15 47
IV.MMO1.EHZ. 2021-10-17T05:08:00.31 3.0 positive manual P -0.18 0
IV.MML1.EHZ. 2021-10-17T05:07:59.16 0.6 negative manual P 25 0.3777 50 -0.07 47
IV.CESX.HHZ. 2021-10-17T05:07:59.69 0.6 undecidable manual S 217 0.2032 50 -0.17 47
IV.ARRO.EHZ. 2021-10-17T05:07:59.79 0.6 undecidable manual S 177 0.1916 50 0.27 48
IV.MOMA.HHZ. 2021-10-17T05:07:57.74 0.3 undecidable manual S 284 0.1385 125 -0.11 74
IV.CESI.HHZ. 2021-10-17T05:07:57.11 0.6 undecidable manual P 25 0.2581 50 -0.08 48
IV.NRCA.HHZ. 2021-10-17T05:07:57.27 0.1 undecidable manual P 77 0.2716 50 -0.15 95
IV.LNSS.HHZ. 2021-10-17T05:07:57.32 0.1 undecidable manual P 129 0.2698 50 -0.06 96
IV.GAVE.EHZ. 2021-10-17T05:07:57.40 0.6 undecidable manual S 127 0.1295 127 -0.17 50
IV.ASSB.HHZ. 2021-10-17T05:07:57.73 0.6 undecidable manual P 346 0.2797 50 0.17 47
IV.CESX.HHZ. 2021-10-17T05:07:56.31 1.0 negative manual P 217 0.2032 50 0.06 25
IV.ARRO.EHZ. 2021-10-17T05:07:56.26 0.1 undecidable manual P 177 0.1916 50 0.21 96
IV.MOMA.HHZ. 2021-10-17T05:07:55.07 0.1 negative manual P 284 0.1385 125 -0.02 100
IV.GAVE.EHZ. 2021-10-17T05:07:54.99 0.3 undecidable manual P 127 0.1295 127 0.06 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.GAVE.EHN. ML:1.2 0.0001625 1.12 AML other m 2021-10-17T05:07:57.85
IV.MOMA.HHE. ML:1.4 0.00021 0.2 AML other m 2021-10-17T05:07:58.20
IV.GAVE.EHE. ML:1.3 0.0001885 0.48 AML other m 2021-10-17T05:07:58.31
IV.MOMA.HHN. ML:1 8.32E-5 0.2 AML other m 2021-10-17T05:07:58.92
IV.CESX.HHN. ML:1.1 7.325E-5 0.36 AML other m 2021-10-17T05:08:00.55
IV.CESX.HHE. ML:1 6.43E-5 0.32 AML other m 2021-10-17T05:08:01.31
IV.LNSS.HHE. ML:1.3 9.19E-5 1.02 AML other m 2021-10-17T05:08:01.97
IV.LNSS.HHN. ML:1.2 7.5E-5 0.88 AML other m 2021-10-17T05:08:02.13
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