Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 02-12-2020 and time 08:27:16 (UTC) in region 6 km NW Arquata del Tronto (AP)

A magnitude ML 1.7 earthquake occured in region: 6 km NW Arquata del Tronto (AP), on

  • 02-12-2020 08:27:16 (UTC)
  • 02-12-2020 09:27:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.81, 13.25 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Arquata del Tronto AP 6 1178 1178
Montegallo AP 8 523 1701
Castelsantangelo sul Nera MC 12 281 1982
Montemonaco AP 12 604 2586
Norcia PG 13 4957 7543
Accumoli RI 13 667 8210
Acquasanta Terme AP 14 2916 11126
Montefortino FM 17 1178 12304
Ussita MC 18 444 12748
Preci PG 19 724 13472
Visso MC 19 1107 14579
Roccafluvione AP 20 2010 16589

Municipalities with at least 50000 inhabitants

An earthquake occurred to
41 Km W of Teramo (54892 inhabitants)
47 Km E of Foligno (57155 inhabitants)
52 Km N of L'Aquila (69753 inhabitants)
56 Km E of Terni (111501 inhabitants)
77 Km E of Perugia (166134 inhabitants)
81 Km W of Montesilvano (53738 inhabitants)
88 Km W of Pescara (121014 inhabitants)
91 Km NW of Chieti (51815 inhabitants)
93 Km S of Ancona (100861 inhabitants)
99 Km NE of Guidonia Montecelio (88673 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 1.7 2020-12-02
08:27:16		 42.81 13.25 11 2020-12-02
08:32:10		 Sala Sismica INGV-Roma 85149381
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-02 08:27:16 ± 0.05
Latitude 42.81 ± 0.00
Longitude 13.25 ± 0.00
Depth (km) 11 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85149381

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 240
Semi-minor axis of confidence ellipse (meter) 140
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 261
Circular confidence region, given by single value of horizontal uncertainty (meter) 240
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.31836
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:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 10
Type of magnitude ML
Reference to an origin 85149381
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-02 08:32:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LNSS.HHZ. 2020-12-02T08:27:26.45 0.6 undecidable manual S 216 0.2554 90 0.15 47
IV.FDMO.HHZ. 2020-12-02T08:27:25.89 0.6 undecidable manual S 333 0.2563 90 -0.42 44
IV.SMA1.EHZ. 2020-12-02T08:27:24.22 0.6 undecidable manual S 160 0.1898 90 -0.12 49
IV.MNTT.EHZ. 2020-12-02T08:27:24.58 3.0 undecidable manual P 0.35 0
IV.MC2.EHZ. 2020-12-02T08:27:22.21 0.6 undecidable manual S 338 0.1115 105 0.18 49
IV.CSP1.EHZ. 2020-12-02T08:27:22.37 1.0 positive manual P 354 0.2851 90 -0.19 23
IV.CESI.HHZ. 2020-12-02T08:27:22.95 0.1 undecidable manual P 308 0.3184 90 -0.18 92
IV.MTRA.EHZ. 2020-12-02T08:27:22.11 0.3 undecidable manual S 115 0.1214 93 -0.22 74
IV.LNSS.HHZ. 2020-12-02T08:27:21.93 0.1 undecidable manual P 216 0.2554 90 -0.13 96
IV.MMO1.EHZ. 2020-12-02T08:27:21.88 0.6 undecidable manual S 33 0.1079 107 -0.06 50
IV.MF5.EHZ. 2020-12-02T08:27:21.95 0.1 undecidable manual P 41 0.2374 90 0.19 93
IV.NRCA.HNZ. 2020-12-02T08:27:21.65 0.6 undecidable manual S 284 0.0998 113 -0.07 49
IV.SMA1.EHZ. 2020-12-02T08:27:21.07 0.1 undecidable manual P 160 0.1898 90 0.14 94
IV.FDMO.HHZ. 2020-12-02T08:27:21.83 0.6 negative manual P 333 0.2563 90 -0.24 46
IV.MTRA.EHZ. 2020-12-02T08:27:19.70 0.1 undecidable manual P 115 0.1214 93 -0.07 99
IV.MC2.EHZ. 2020-12-02T08:27:19.74 0.1 negative manual P 338 0.1115 105 0.14 98
IV.MMO1.EHZ. 2020-12-02T08:27:19.54 0.1 undecidable manual P 33 0.1079 107 -0.01 99
IV.NRCA.HNZ. 2020-12-02T08:27:19.46 0.1 undecidable manual P 284 0.0998 113 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HNN. ML:2.4 0.00286 0.1 AML other m 2020-12-02T08:27:21.81
IV.NRCA.HHN. ML:2.5 0.00329 0.1 AML other m 2020-12-02T08:27:21.81
IV.NRCA.HNE. ML:2.5 0.00372 0.14 AML other m 2020-12-02T08:27:21.88
IV.NRCA.HHE. ML:2.5 0.003795 0.16 AML other m 2020-12-02T08:27:21.81
IV.MTRA.EHE. ML:1.6 0.0003745 0.84 AML other m 2020-12-02T08:27:22.83
IV.MTRA.EHN. ML:1.5 0.000344 0.22 AML other m 2020-12-02T08:27:22.73
IV.LNSS.HHN. ML:1.4 0.0001332 0.2 AML other m 2020-12-02T08:27:26.87
IV.LNSS.HHE. ML:1.4 0.0001202 0.64 AML other m 2020-12-02T08:27:27.81
IV.CESI.HHE. ML:1.4 9.985E-5 0.2 AML other m 2020-12-02T08:27:28.38
IV.CESI.HHN. ML:1.6 0.000158 0.5 AML other m 2020-12-02T08:27:28.41
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