Earthquake with magnitude of ML 1.0 on date 17-10-2021 and time 18:33:23 (UTC) in region 4 km SE Norcia (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km SE Norcia (PG), on

  • 17-10-2021 18:33:23 (UTC)
  • 17-10-2021 20:33:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.757, 13.115 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
Norcia PG 4 4957 4957
Cascia PG 9 3217 8174
Accumoli RI 13 667 8841
Preci PG 15 724 9565
Arquata del Tronto AP 15 1178 10743
Poggiodomo PG 16 117 10860
Castelsantangelo sul Nera MC 16 281 11141
Cittareale RI 16 482 11623
Cerreto di Spoleto PG 18 1075 12698
Monteleone di Spoleto PG 18 599 13297
Visso MC 20 1107 14404
Amatrice RI 20 2657 17061

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SE of Foligno (57155 inhabitants)
44 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
51 Km NW of L'Aquila (69753 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
90 Km NE of Guidonia Montecelio (88673 inhabitants)
91 Km E of Viterbo (67173 inhabitants)
92 Km N of Tivoli (56533 inhabitants)
96 Km W of Pescara (121014 inhabitants)
97 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 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 1.0 2021-10-17
18:33:23
42.7568 13.1152 11 2021-10-17
18:37:57
Sala Sismica INGV-Roma 96693971
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-17 18:33:23 ± 0.05
Latitude 42.7568 ± 0.0018
Longitude 13.1152 ± 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 96693971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 261
Semi-minor axis of confidence ellipse (meter) 129
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 291
Circular confidence region, given by single value of horizontal uncertainty (meter) 260
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.34174
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 96693971
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-17 18:37:57
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ATMI.HHZ. 2021-10-17T18:33:48.99 3.0 undecidable manual S -4.16 0
IV.CSP1.EHZ. 2021-10-17T18:33:35.98 0.6 undecidable manual S 11 0.3408 50 0.18 47
IV.CESI.HHZ. 2021-10-17T18:33:34.41 0.6 undecidable manual S 328 0.2923 50 0.07 48
IV.FDMO.HHZ. 2021-10-17T18:33:33.82 0.3 undecidable manual S 356 0.2806 50 -0.17 71
IV.RM33.EHZ. 2021-10-17T18:33:33.20 0.6 undecidable manual S 164 0.2581 50 -0.14 48
IV.ASSB.HHZ. 2021-10-17T18:33:32.63 3.0 positive manual P 0.17 0
IV.SNTG.HHZ. 2021-10-17T18:33:32.31 3.0 undecidable manual P -1.47 0
IV.MOMA.HHZ. 2021-10-17T18:33:31.81 3.0 undecidable manual P 0.02 0
IV.MMO1.EHZ. 2021-10-17T18:33:31.71 0.3 undecidable manual S 47 0.2104 50 -0.22 71
IV.TERO.HHZ. 2021-10-17T18:33:31.03 3.0 undecidable manual P -0.28 0
IV.SMA1.EHZ. 2021-10-17T18:33:31.75 0.3 undecidable manual S 128 0.205 50 -0.02 74
IV.GAVE.EHZ. 2021-10-17T18:33:30.83 0.3 undecidable manual S 248 0.1745 50 -0.04 75
IV.LNSS.HHZ. 2021-10-17T18:33:30.57 0.3 undecidable manual S 200 0.1637 50 0.04 75
IV.CSP1.EHZ. 2021-10-17T18:33:30.41 0.6 positive manual P 11 0.3408 50 -0.07 48
IV.MC2.EHZ. 2021-10-17T18:33:30.66 0.3 undecidable manual S 19 0.1637 50 0.12 73
IV.MF5.EHZ. 2021-10-17T18:33:30.95 0.6 negative manual P 47 0.3417 50 0.47 44
IV.ARRO.EHZ. 2021-10-17T18:33:29.97 0.6 negative manual P 235 0.3121 50 -0.01 49
IV.RM33.EHZ. 2021-10-17T18:33:29.09 1.0 undecidable manual P 164 0.2581 50 0.04 24
IV.FDMO.HHZ. 2021-10-17T18:33:29.36 0.6 negative manual P 356 0.2806 50 -0.07 48
IV.CESI.HHZ. 2021-10-17T18:33:29.57 1.0 undecidable manual P 328 0.2923 50 -0.06 24
IV.SMA1.EHZ. 2021-10-17T18:33:28.23 1.0 undecidable manual P 128 0.205 50 0.08 24
IV.MMO1.EHZ. 2021-10-17T18:33:28.12 1.0 positive manual P 47 0.2104 50 -0.12 24
IV.LNSS.HHZ. 2021-10-17T18:33:27.46 0.1 positive manual P 200 0.1637 50 0.03 100
IV.MC2.EHZ. 2021-10-17T18:33:27.51 1.0 positive manual P 19 0.1637 50 0.07 25
IV.NRCA.HNZ. 2021-10-17T18:33:27.80 0.6 undecidable manual S 360 0.0764 142 -0.22 49
IV.GAVE.EHZ. 2021-10-17T18:33:27.62 0.1 positive manual P 248 0.1745 50 -0.01 100
IV.NRCA.HNZ. 2021-10-17T18:33:26.08 0.1 undecidable manual P 360 0.0764 142 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHE. ML:1.7 0.000613 0.16 AML other m 2021-10-17T18:33:27.97
IV.NRCA.HNE. ML:1.7 0.0006095 0.16 AML other m 2021-10-17T18:33:27.97
IV.NRCA.HNN. ML:1.5 0.000406 0.6 AML other m 2021-10-17T18:33:28.35
IV.NRCA.HHN. ML:1.5 0.000444 1.6 AML other m 2021-10-17T18:33:28.85
IV.LNSS.HHN. ML:1.2 0.0001195 1.58 AML other m 2021-10-17T18:33:31.81
IV.LNSS.HHE. ML:1.3 0.0001555 0.98 AML other m 2021-10-17T18:33:31.26
IV.GAVE.EHN. ML:1.2 0.000128 0.32 AML other m 2021-10-17T18:33:31.43
IV.GAVE.EHE. ML:1.3 0.000142 1.82 AML other m 2021-10-17T18:33:31.97
IV.SMA1.EHN. ML:0.8 4.67E-5 0.46 AML other m 2021-10-17T18:33:32.82
IV.SMA1.EHE. ML:0.9 5.255E-5 0.22 AML other m 2021-10-17T18:33:33.80
IV.RM33.EHN. ML:0.8 3.345E-5 1.56 AML other m 2021-10-17T18:33:34.84
IV.FDMO.HHN. ML:0.7 2.42E-5 0.44 AML other m 2021-10-17T18:33:35.31
IV.FDMO.HHE. ML:0.6 1.91E-5 0.52 AML other m 2021-10-17T18:33:35.30
IV.RM33.EHE. ML:0.7 2.625E-5 0.86 AML other m 2021-10-17T18:33:35.39
IV.MOMA.HHE. ML:0.9 2.645E-5 1.82 AML other m 2021-10-17T18:33:39.03
IV.ASSB.HHN. ML:0.9 1.82E-5 0.58 AML other m 2021-10-17T18:33:39.55
IV.ASSB.HHE. ML:0.9 2.115E-5 0.7 AML other m 2021-10-17T18:33:40.35
IV.MOMA.HHN. ML:0.8 1.965E-5 1.22 AML other m 2021-10-17T18:33:40.07
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