Earthquake with magnitude of ML 0.7 on date 20-10-2021 and time 03:46:57 (Italy) in region 8 km E Norcia (PG)

A magnitude ML 0.7 earthquake occured in region: 8 km E Norcia (PG), on

  • 20-10-2021 01:46:57 (UTC)
  • 20-10-2021 03:46:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.76, 13.177 at 1 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 8 4957 4957
Accumoli RI 9 667 5624
Arquata del Tronto AP 10 1178 6802
Cascia PG 14 3217 10019
Castelsantangelo sul Nera MC 15 281 10300
Cittareale RI 16 482 10782
Montegallo AP 16 523 11305
Amatrice RI 17 2657 13962
Preci PG 17 724 14686
Acquasanta Terme AP 19 2916 17602
Montemonaco AP 20 604 18206

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km SE of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
49 Km E of Terni (111501 inhabitants)
49 Km NW of L'Aquila (69753 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
93 Km W of Chieti (51815 inhabitants)
94 Km NE of Tivoli (56533 inhabitants)
96 Km E of Viterbo (67173 inhabitants)
99 Km S 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 0.7 2021-10-20
01:46:57
42.7602 13.1767 1 2021-10-20
01:55:04
Sala Sismica INGV-Roma 96780211
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-20 01:46:57 ± 0.31
Latitude 42.7602 ± 0.0135
Longitude 13.1767 ± 0.0233
Depth (km) 1 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96780211

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2170
Semi-minor axis of confidence ellipse (meter) 1140
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 239
Circular confidence region, given by single value of horizontal uncertainty (meter) 2170
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 170
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 10
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.63
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.25271
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 96780211
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-20 01:55:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MC2.EHZ. 2021-10-20T01:48:27.53 3.0 undecidable manual P 0
IV.FIR.HHZ. 2021-10-20T01:47:38.50 3.0 undecidable manual Sg -0.17 0
IV.PAOL.HHZ. 2021-10-20T01:47:29.11 3.0 undecidable manual Pn 0.65 0
IV.RM33.EHZ. 2021-10-20T01:47:05.54 0.3 undecidable manual S 174 0.2527 91 -1.88 35
IV.LNSS.HHZ. 2021-10-20T01:47:05.07 0.3 undecidable manual S 213 0.1862 92 0.19 79
IV.SMA1.EHZ. 2021-10-20T01:47:04.52 0.3 undecidable manual S 138 0.1745 92 0.11 81
IV.T1299.EHE. 2021-10-20T01:47:03.29 0.3 undecidable manual S 148 0.1475 93 -0.1 82
IV.LNSS.HHZ. 2021-10-20T01:47:02.36 0.1 undecidable manual P 213 0.1862 92 0.52 98
IV.RM33.EHZ. 2021-10-20T01:47:02.53 0.6 undecidable manual P 174 0.2527 91 -0.78 44
IV.SMA1.EHZ. 2021-10-20T01:47:02.01 0.6 negative manual P 138 0.1745 92 0.44 50
IV.NRCA.HHZ. 2021-10-20T01:47:01.24 0.3 undecidable manual S 328 0.0863 94 0.21 81
IV.T1299.EHE. 2021-10-20T01:47:01.48 0.1 undecidable manual P 148 0.1475 93 0.5 100
IV.NRCA.HHZ. 2021-10-20T01:46:58.75 0.3 undecidable manual P 328 0.0863 94 -0.87 65
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:0.8 4.91E-5 0.16 AML other m 2021-10-20T01:47:04.69
IV.SMA1.EHE. ML:0.6 3.455E-5 0.14 AML other m 2021-10-20T01:47:04.69
IV.NRCA.HHE. ML:0.3 3.425E-5 1.86 AML other m 2021-10-20T01:47:06.96
IV.NRCA.HHN. ML:0.1 2.06E-5 0.42 AML other m 2021-10-20T01:47:06.76
IV.PAOL.HHE. ML:2 2.55E-5 0.2 AML other m 2021-10-20T01:47:41.84
IV.FIR.HHE. ML:2.9 0.000258 0.7 AML other m 2021-10-20T01:47:42.53
IV.FIR.HNE. ML:3 0.0002985 0.62 AML other m 2021-10-20T01:47:47.89
IV.FIR.HHN. ML:3.1 0.000431 0.08 AML other m 2021-10-20T01:47:48.30
IV.FIR.HNN. ML:3.1 0.0004115 0.98 AML other m 2021-10-20T01:47:48.26
IV.PAOL.HHN. ML:2.2 3.475E-5 0.78 AML other m 2021-10-20T01:48:09.54
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