Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-11-2020 and time 09:16:53 (UTC) in region 1 km NE Ussita (MC)

A magnitude ML 1.6 earthquake occured in region: 1 km NE Ussita (MC), on

  • 27-11-2020 09:16:53 (UTC)
  • 27-11-2020 10:16:53 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.96, 13.15 at 8 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ussita MC 1 444 444
Visso MC 5 1107 1551
Castelsantangelo sul Nera MC 7 281 1832
Bolognola MC 8 142 1974
Acquacanina MC 9 121 2095
Fiastra MC 9 559 2654
Fiordimonte MC 10 202 2856
Preci PG 12 724 3580
Monte Cavallo MC 13 145 3725
Pieve Torina MC 13 1458 5183
Pievebovigliana MC 13 866 6049
Sarnano MC 15 3264 9313
Montefortino FM 16 1178 10491
Montemonaco AP 16 604 11095
Muccia MC 16 915 12010
Amandola FM 17 3629 15639
Norcia PG 19 4957 20596
Sellano PG 19 1079 21675
Cessapalombo MC 19 512 22187
Montegallo AP 20 523 22710
Gualdo MC 20 815 23525

Municipalities with at least 50000 inhabitants

An earthquake occurred to
36 Km E of Foligno (57155 inhabitants)
56 Km NW of Teramo (54892 inhabitants)
60 Km NE of Terni (111501 inhabitants)
64 Km E of Perugia (166134 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
80 Km SW of Ancona (100861 inhabitants)
96 Km NW of Montesilvano (53738 inhabitants)
99 Km S of Fano (60888 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 1.6 2020-11-27
09:16:53		 42.96 13.15 8 2020-11-27
09:23:21		 Sala Sismica INGV-Roma 85047181
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-11-27 09:16:53 ± 0.11
Latitude 42.96 ± 0.01
Longitude 13.15 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85047181

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 666
Semi-minor axis of confidence ellipse (meter) 425
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 227
Circular confidence region, given by single value of horizontal uncertainty (meter) 670
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.31
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.47304
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 10
Magnitude information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.1
Num. used stations 10
Type of magnitude ML
Reference to an origin 85047181
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-11-27 09:23:21
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.TERO.HHZ. 2020-11-27T09:17:09.89 0.6 undecidable manual S 135 0.473 50 -0.19 46
IV.CAMP.HHZ. 2020-11-27T09:17:09.82 0.6 undecidable manual S 155 0.4623 50 0.05 47
IV.OFFI.HHZ. 2020-11-27T09:17:07.19 0.6 undecidable manual S 93 0.3948 50 -0.57 43
IV.MF5.EHZ. 2020-11-27T09:17:03.26 0.3 undecidable manual S 82 0.2311 108 0.89 58
IV.CAMP.HHZ. 2020-11-27T09:17:02.22 0.3 undecidable manual P 155 0.4623 50 -0.47 65
IV.TERO.HHZ. 2020-11-27T09:17:02.80 0.3 undecidable manual P 135 0.473 50 -0.06 71
IV.OFFI.HHZ. 2020-11-27T09:17:02.12 0.1 undecidable manual P 93 0.3948 50 0.59 84
IV.CESI.HHZ. 2020-11-27T09:17:01.05 0.3 undecidable manual S 285 0.1835 112 0.4 70
IV.EL6.EHZ. 2020-11-27T09:17:00.72 3.0 positive manual P -0.7 0
IV.MMO1.EHZ. 2020-11-27T09:16:59.04 0.6 undecidable manual S 113 0.1439 118 -0.22 49
IV.NRCA.HHZ. 2020-11-27T09:16:59.11 0.6 undecidable manual S 191 0.125 121 0.47 46
IV.MF5.EHZ. 2020-11-27T09:16:58.67 0.1 undecidable manual P 82 0.2311 108 0.26 95
IV.CSP1.EHZ. 2020-11-27T09:16:58.99 0.3 undecidable manual S 17 0.1421 118 -0.2 73
IV.FDMO.HHZ. 2020-11-27T09:16:57.38 0.3 undecidable manual S 331 0.0908 130 -0.18 75
IV.CESI.HHZ. 2020-11-27T09:16:57.49 0.3 undecidable manual P 285 0.1835 112 0.07 75
IV.NRCA.HHZ. 2020-11-27T09:16:56.34 0.3 positive manual P 191 0.125 121 0.08 76
IV.MC2.EHZ. 2020-11-27T09:16:56.18 0.6 undecidable manual S 146 0.0549 144 -0.42 48
IV.CSP1.EHZ. 2020-11-27T09:16:56.41 0.6 undecidable manual P 17 0.1421 118 -0.17 49
IV.MMO1.EHZ. 2020-11-27T09:16:56.45 0.1 undecidable manual P 113 0.1439 118 -0.17 99
IV.FDMO.HHZ. 2020-11-27T09:16:55.36 0.3 undecidable manual P 331 0.0908 130 -0.28 73
IV.MC2.EHZ. 2020-11-27T09:16:54.90 0.1 undecidable manual P 146 0.0549 144 -0.18 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FDMO.HHN. ML:1.7 0.000728 1.74 AML other m 2020-11-27T09:16:57.99
IV.FDMO.HHE. ML:1.5 0.0004655 1.06 AML other m 2020-11-27T09:16:58.55
IV.NRCA.HHE. ML:1.5 0.000329 1.3 AML other m 2020-11-27T09:16:59.12
IV.CSP1.EHE. ML:1.5 0.0003195 0.52 AML other m 2020-11-27T09:17:00.36
IV.NRCA.HHN. ML:1.5 0.0003365 0.96 AML other m 2020-11-27T09:17:00.05
IV.CSP1.EHN. ML:1.6 0.000421 1.36 AML other m 2020-11-27T09:17:00.89
IV.CESI.HHE. ML:1.6 0.0002875 0.24 AML other m 2020-11-27T09:17:01.60
IV.CESI.HHN. ML:1.6 0.0003145 0.34 AML other m 2020-11-27T09:17:03.29
IV.NRCA.HNE. ML:1.5 0.00032175295 0.1152 AML other m 2020-11-27T09:17:00.12
IV.NRCA.HNN. ML:1.6 0.00038381825 0.8704 AML other m 2020-11-27T09:16:59.56
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download