Earthquake with magnitude of ML 1.3 on date 20-10-2021 and time 00:16:15 (UTC) in region 4 km S Norcia (PG)

A magnitude ML 1.3 earthquake occured in region: 4 km S Norcia (PG), on

  • 20-10-2021 00:16:15 (UTC)
  • 20-10-2021 02:16:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.755, 13.093 at 10 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
Norcia PG 4 4957 4957
Cascia PG 8 3217 8174
Poggiodomo PG 14 117 8291
Accumoli RI 14 667 8958
Preci PG 15 724 9682
Cittareale RI 16 482 10164
Cerreto di Spoleto PG 16 1075 11239
Monteleone di Spoleto PG 16 599 11838
Castelsantangelo sul Nera MC 16 281 12119
Arquata del Tronto AP 17 1178 13297
Vallo di Nera PG 19 364 13661
Visso MC 20 1107 14768

Municipalities with at least 50000 inhabitants

An earthquake occurred to
39 Km SE of Foligno (57155 inhabitants)
42 Km NE of Terni (111501 inhabitants)
51 Km W of Teramo (54892 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
69 Km SE of Perugia (166134 inhabitants)
89 Km NE of Guidonia Montecelio (88673 inhabitants)
89 Km E of Viterbo (67173 inhabitants)
91 Km W of Montesilvano (53738 inhabitants)
91 Km N of Tivoli (56533 inhabitants)
97 Km W of Pescara (121014 inhabitants)
99 Km W of Chieti (51815 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 1.3 2021-10-20
00:16:15
42.7548 13.0927 11 2021-10-20
00:48:50
Sala Sismica INGV-Roma 96778051
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 00:16:15 ± 0.07
Latitude 42.7548 ± 0.0027
Longitude 13.0927 ± 0.0061
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 96778051

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 488
Semi-minor axis of confidence ellipse (meter) 144
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 101
Circular confidence region, given by single value of horizontal uncertainty (meter) 490
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 84
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 19
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34624
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 11
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.4
Num. used stations 14
Type of magnitude ML
Reference to an origin 96778051
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 00:48:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CESI.HHZ. 2021-10-20T00:16:26.37 0.3 undecidable manual S 331 0.2851 50 0.02 72
IV.FDMO.HHZ. 2021-10-20T00:16:26.14 0.3 undecidable manual S 359 0.2815 50 -0.09 73
IV.RM33.EHZ. 2021-10-20T00:16:25.97 0.3 undecidable manual S 160 0.2617 50 0.32 68
IV.MNTT.EHZ. 2021-10-20T00:16:25.92 3.0 positive manual P 0.35 0
IV.MMO1.EHZ. 2021-10-20T00:16:24.62 0.3 undecidable manual S 50 0.2239 50 0.08 72
IV.MC2.EHZ. 2021-10-20T00:16:23.18 0.3 undecidable manual S 24 0.1718 119 0.35 71
IV.LNSS.HHZ. 2021-10-20T00:16:22.55 0.3 undecidable manual S 194 0.1565 121 0.21 75
IV.CSP1.EHZ. 2021-10-20T00:16:22.75 0.1 undecidable manual P 14 0.3462 50 0.03 96
IV.GAVE.EHZ. 2021-10-20T00:16:22.71 0.3 undecidable manual S 247 0.1583 121 0.31 73
IV.FDMO.HHZ. 2021-10-20T00:16:21.40 0.1 undecidable manual P 359 0.2815 50 -0.21 94
IV.ARRO.EHZ. 2021-10-20T00:16:21.76 0.1 undecidable manual P 234 0.2977 50 -0.13 95
IV.RM33.EHZ. 2021-10-20T00:16:21.33 0.1 undecidable manual P 160 0.2617 50 0.06 97
IV.CESI.HHZ. 2021-10-20T00:16:21.70 0.1 undecidable manual P 331 0.2851 50 0.02 97
IV.SMA1.EHZ. 2021-10-20T00:16:20.08 0.1 undecidable manual P 125 0.2176 50 -0.43 90
IV.NRCA.HHZ. 2021-10-20T00:16:20.10 0.1 undecidable manual S 11 0.08 140 0.05 99
IV.MMO1.EHZ. 2021-10-20T00:16:20.57 1.0 undecidable manual P 50 0.2239 50 -0.06 25
IV.GAVE.EHZ. 2021-10-20T00:16:19.48 0.3 positive manual P 247 0.1583 121 0.08 75
IV.LNSS.HHZ. 2021-10-20T00:16:19.50 0.1 undecidable manual P 194 0.1565 121 0.14 100
IV.MC2.EHZ. 2021-10-20T00:16:19.76 0.1 undecidable manual P 24 0.1718 119 0.11 99
IV.NRCA.HHZ. 2021-10-20T00:16:18.21 0.6 undecidable manual P 11 0.08 140 0.17 50
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.8 0.0009215 0.14 AML other m 2021-10-20T00:16:20.15
IV.NRCA.HNN. ML:1.8 0.0008745 0.14 AML other m 2021-10-20T00:16:20.22
IV.NRCA.HNE. ML:1.7 0.0006225 0.16 AML other m 2021-10-20T00:16:20.28
IV.NRCA.HHE. ML:1.7 0.000599 0.92 AML other m 2021-10-20T00:16:20.34
IV.LNSS.HHN. ML:1.3 0.0001765 0.16 AML other m 2021-10-20T00:16:22.75
IV.LNSS.HHE. ML:1.2 0.0001375 1.06 AML other m 2021-10-20T00:16:23.71
IV.GAVE.EHN. ML:1.1 0.000108 0.12 AML other m 2021-10-20T00:16:23.20
IV.GAVE.EHE. ML:1.1 9.78E-5 0.18 AML other m 2021-10-20T00:16:23.28
IV.RM33.EHN. ML:0.6 2.1695E-5 1.34 AML other m 2021-10-20T00:16:26.91
IV.RM33.EHE. ML:0.6 2.155E-5 0.94 AML other m 2021-10-20T00:16:27.04
IV.ARRO.EHN. ML:0.5 1.49E-5 0.66 AML other m 2021-10-20T00:16:27.14
IV.ARRO.EHE. ML:0.7 1.865E-5 1.54 AML other m 2021-10-20T00:16:27.07
IV.MNTT.EHN. ML:1.3 4.515E-5 0.54 AML other m 2021-10-20T00:16:37.75
IV.MNTT.EHE. ML:1.6 9.475E-5 0.72 AML other m 2021-10-20T00:16:37.70
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