Earthquake with magnitude of ML 1.1 on date 26-10-2021 and time 23:46:52 (UTC) in region 3 km NE Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 3 km NE Norcia (PG), on

  • 26-10-2021 23:46:52 (UTC)
  • 27-10-2021 01:46:52 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.808, 13.124 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 3 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Preci PG 11 724 5962
Cascia PG 13 3217 9179
Visso MC 14 1107 10286
Arquata del Tronto AP 15 1178 11464
Ussita MC 15 444 11908
Accumoli RI 16 667 12575
Cerreto di Spoleto PG 17 1075 13650
Montegallo AP 18 523 14173
Sellano PG 18 1079 15252
Poggiodomo PG 19 117 15369
Montemonaco AP 20 604 15973

Municipalities with at least 50000 inhabitants

An earthquake occurred to
38 Km E of Foligno (57155 inhabitants)
48 Km NE of Terni (111501 inhabitants)
50 Km W of Teramo (54892 inhabitants)
56 Km NW of L'Aquila (69753 inhabitants)
68 Km E of Perugia (166134 inhabitants)
90 Km W of Montesilvano (53738 inhabitants)
94 Km E of Viterbo (67173 inhabitants)
96 Km SW of Ancona (100861 inhabitants)
96 Km NE of Guidonia Montecelio (88673 inhabitants)
97 Km W of Pescara (121014 inhabitants)
98 Km N of Tivoli (56533 inhabitants)
99 Km NW 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 1.1 2021-10-26
23:46:52
42.8083 13.124 10 2021-10-26
23:50:53
Sala Sismica INGV-Roma 97010891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-26 23:46:52 ± 0.07
Latitude 42.8083 ± 0.0027
Longitude 13.1240 ± 0.0061
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97010891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 463
Semi-minor axis of confidence ellipse (meter) 268
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 460
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 85
Number of associated phases, regardless of their use for origin computation 26
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.02608
Epicentral distance of station farthest from the epicenter (degree) 0.3984
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 97010891
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-26 23:50:53
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2021-10-26T23:47:06.63 0.1 undecidable manual S 118 0.3984 50 -0.48 88
IV.MF5.EHZ. 2021-10-26T23:47:05.15 0.1 undecidable manual S 54 0.304 50 0.82 78
IV.RM33.EHZ. 2021-10-26T23:47:04.63 0.1 undecidable manual S 167 0.3067 50 0.24 94
IV.MML1.EHZ. 2021-10-26T23:47:04.78 0.1 undecidable manual S 340 0.3247 50 -0.15 95
IV.CSP1.EHZ. 2021-10-26T23:47:03.86 0.1 undecidable manual S 12 0.2896 50 -0.03 98
IV.CESI.HHZ. 2021-10-26T23:47:02.74 0.1 undecidable manual S 321 0.2536 50 -0.09 98
IV.FDMO.HHZ. 2021-10-26T23:47:02.13 0.1 undecidable manual S 353 0.2293 50 0.01 100
IV.SMA1.EHZ. 2021-10-26T23:47:02.15 0.1 undecidable manual S 139 0.2356 50 -0.15 97
IV.GAVE.EHZ. 2021-10-26T23:47:01.21 0.1 undecidable manual S 236 0.205 114 -0.03 100
IV.LNSS.HHZ. 2021-10-26T23:47:01.87 0.1 undecidable manual S 197 0.214 113 0.28 95
IV.TERO.HHZ. 2021-10-26T23:47:00.87 1.0 undecidable manual P 118 0.3984 50 -0.12 24
IV.MML1.EHZ. 2021-10-26T23:46:59.65 1.0 undecidable manual P 340 0.3247 50 -0.08 24
IV.MF5.EHZ. 2021-10-26T23:46:59.83 1.0 positive manual P 54 0.304 50 0.45 22
IV.MMO1.EHZ. 2021-10-26T23:46:59.74 0.1 undecidable manual S 58 0.1745 117 -0.44 92
IV.RM33.EHZ. 2021-10-26T23:46:59.37 1.0 undecidable manual P 167 0.3067 50 -0.05 24
IV.SMA1.EHZ. 2021-10-26T23:46:58.16 1.0 undecidable manual P 139 0.2356 50 -0.05 25
IV.CESI.HHZ. 2021-10-26T23:46:58.45 0.1 negative manual P 321 0.2536 50 -0.06 98
IV.MC2.EHZ. 2021-10-26T23:46:58.77 0.1 undecidable manual S 25 0.1133 129 0.56 90
IV.CSP1.EHZ. 2021-10-26T23:46:58.95 1.0 undecidable manual P 12 0.2896 50 -0.18 24
IV.GAVE.EHZ. 2021-10-26T23:46:57.77 1.0 negative manual P 236 0.205 114 0.17 24
IV.FDMO.HHZ. 2021-10-26T23:46:57.86 0.6 positive manual P 353 0.2293 50 -0.25 48
IV.LNSS.HHZ. 2021-10-26T23:46:57.86 1.0 negative manual P 197 0.214 113 0.06 25
IV.MMO1.EHZ. 2021-10-26T23:46:56.89 0.6 positive manual P 58 0.1745 117 -0.1 50
IV.MC2.EHZ. 2021-10-26T23:46:56.04 0.6 positive manual P 25 0.1133 129 0.19 49
IV.NRCA.HHZ. 2021-10-26T23:46:55.95 0.1 undecidable manual S 344 0.0261 164 -0.3 98
IV.NRCA.HHZ. 2021-10-26T23:46:54.71 0.6 undecidable manual P 344 0.0261 164 -0.01 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNE. ML:1.4 0.000532 0.72 AML other m 2021-10-26T23:46:56.43
IV.NRCA.HHE. ML:1.5 0.000572 0.7 AML other m 2021-10-26T23:46:56.43
IV.NRCA.HNN. ML:1.4 0.0004025 0.76 AML other m 2021-10-26T23:46:56.08
IV.NRCA.HHN. ML:1.3 0.00037 0.12 AML other m 2021-10-26T23:46:56.08
IV.GAVE.EHE. ML:0.9 5.43E-5 0.88 AML other m 2021-10-26T23:47:01.82
IV.GAVE.EHN. ML:0.9 4.835E-5 0.14 AML other m 2021-10-26T23:47:02.18
IV.LNSS.HHE. ML:1.1 7.49E-5 0.36 AML other m 2021-10-26T23:47:02.13
IV.LNSS.HHN. ML:1 5.375E-5 0.12 AML other m 2021-10-26T23:47:02.34
IV.CESI.HHN. ML:0.9 4.335E-5 1.76 AML other m 2021-10-26T23:47:03.00
IV.CESI.HHE. ML:0.8 3.185E-5 0.76 AML other m 2021-10-26T23:47:03.01
IV.TERO.HHN. ML:0.8 1.855E-5 0.54 AML other m 2021-10-26T23:47:08.58
IV.TERO.HHE. ML:1.6 0.000125 1.28 AML other m 2021-10-26T23:47:10.66
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