Earthquake with magnitude of ML 1.0 on date 15-10-2021 and time 22:58:09 (Italy) in region 3 km E Cerreto di Spoleto (PG)

A magnitude ML 1.0 earthquake occured in region: 3 km E Cerreto di Spoleto (PG), on

  • 15-10-2021 20:58:09 (UTC)
  • 15-10-2021 22:58:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.829, 12.947 at 12 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
Cerreto di Spoleto PG 3 1075 1075
Sellano PG 7 1079 2154
Preci PG 9 724 2878
Vallo di Nera PG 10 364 3242
Norcia PG 13 4957 8199
Poggiodomo PG 13 117 8316
Cascia PG 13 3217 11533
Campello sul Clitunno PG 14 2442 13975
Sant'Anatolia di Narco PG 14 564 14539
Scheggino PG 16 461 15000
Visso MC 16 1107 16107
Trevi PG 17 8469 24576
Castelsantangelo sul Nera MC 18 281 24857
Monte Cavallo MC 19 145 25002
Monteleone di Spoleto PG 20 599 25601
Spoleto PG 20 38218 63819

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km SE of Foligno (57155 inhabitants)
39 Km NE of Terni (111501 inhabitants)
55 Km SE of Perugia (166134 inhabitants)
65 Km NW of L'Aquila (69753 inhabitants)
65 Km W of Teramo (54892 inhabitants)
83 Km NE of Viterbo (67173 inhabitants)
94 Km N of Guidonia Montecelio (88673 inhabitants)
97 Km N of Tivoli (56533 inhabitants)
99 Km SW of Ancona (100861 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 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 1.0 2021-10-15
20:58:09
42.8293 12.9467 12 2021-10-15
21:01:46
Sala Sismica INGV-Roma 96625421
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-15 20:58:09 ± 0.05
Latitude 42.8293 ± 0.0018
Longitude 12.9467 ± 0.0037
Depth (km) 12 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96625421

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 340
Semi-minor axis of confidence ellipse (meter) 120
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 340
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 154
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.07
Epicentral distance of station closest to the epicenter (degree) 0.12321
Epicentral distance of station farthest from the epicenter (degree) 0.23652
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 96625421
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-15 21:01:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.FDMO.HHZ. 2021-10-15T20:58:18.54 0.6 undecidable manual S 26 0.2311 93 -0.05 50
IV.LNSS.HHZ. 2021-10-15T20:58:18.71 0.6 undecidable manual S 163 0.2365 93 -0.04 50
IV.CESI.HHZ. 2021-10-15T20:58:16.94 0.6 undecidable manual S 350 0.1781 95 -0.09 51
IV.NRCA.HHZ. 2021-10-15T20:58:15.34 0.6 undecidable manual S 88 0.1232 109 -0.07 52
IV.GAVE.EHZ. 2021-10-15T20:58:15.84 0.6 undecidable manual S 196 0.1421 101 -0.13 52
IV.FDMO.HHZ. 2021-10-15T20:58:14.68 0.6 positive manual P 26 0.2311 93 0.02 49
IV.LNSS.HHZ. 2021-10-15T20:58:14.72 0.1 undecidable manual P 163 0.2365 93 -0.03 100
IV.CESI.HHZ. 2021-10-15T20:58:13.80 0.3 positive manual P 350 0.1781 95 0.04 75
IV.GAVE.EHZ. 2021-10-15T20:58:13.21 0.1 undecidable manual P 196 0.1421 101 0.07 100
IV.NRCA.HHZ. 2021-10-15T20:58:12.93 0.1 negative manual P 88 0.1232 109 0.11 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.1 6.45E-5 0.42 AML other m 2021-10-15T20:58:14.62
IV.NRCA.HHE. ML:0.9 7.995E-5 0.16 AML other m 2021-10-15T20:58:15.46
IV.NRCA.HHN. ML:0.9 6.94E-5 0.8 AML other m 2021-10-15T20:58:15.98
IV.LNSS.HHN. ML:1.1 6.54E-5 0.42 AML other m 2021-10-15T20:58:29.50
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