Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 31-12-2020 and time 00:42:16 (UTC) in region 3 km W Montemonaco (AP)

A magnitude ML 1.1 earthquake occured in region: 3 km W Montemonaco (AP), on

  • 31-12-2020 00:42:16 (UTC)
  • 31-12-2020 01:42:16 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8980, 13.2960 at 25 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
Montemonaco AP 3 604 604
Montefortino FM 6 1178 1782
Montegallo AP 7 523 2305
Amandola FM 10 3629 5934
Castelsantangelo sul Nera MC 12 281 6215
Comunanza AP 12 3166 9381
Bolognola MC 12 142 9523
Palmiano AP 13 196 9719
Ussita MC 14 444 10163
Arquata del Tronto AP 14 1178 11341
Roccafluvione AP 15 2010 13351
Sarnano MC 15 3264 16615
Venarotta AP 16 2066 18681
Montefalcone Appennino FM 17 424 19105
Acquasanta Terme AP 17 2916 22021
Smerillo FM 17 365 22386
Visso MC 17 1107 23493
Force AP 18 1354 24847
Acquacanina MC 18 121 24968
Monte San Martino MC 19 765 25733
Fiastra MC 19 559 26292
Gualdo MC 19 815 27107

Municipalities with at least 50000 inhabitants

An earthquake occurred to
43 Km NW of Teramo (54892 inhabitants)
49 Km E of Foligno (57155 inhabitants)
61 Km N of L'Aquila (69753 inhabitants)
65 Km NE of Terni (111501 inhabitants)
77 Km E of Perugia (166134 inhabitants)
82 Km NW of Montesilvano (53738 inhabitants)
82 Km S of Ancona (100861 inhabitants)
89 Km NW of Pescara (121014 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.1 2020-12-31
00:42:16		 42.8985 13.2962 25 2020-12-31
00:51:03		 Sala Sismica INGV-Roma 85891831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 00:42:16 ± 0.13
Latitude 42.8985 ± 0.0036
Longitude 13.2962 ± 0.0061
Depth (km) 25 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85891831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 489
Semi-minor axis of confidence ellipse (meter) 128
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 241
Circular confidence region, given by single value of horizontal uncertainty (meter) 490.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
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) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.26890
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:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 85891831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-31 00:51:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SMA1.EHZ. 2020-12-31T00:42:28.24 0.3 undecidable manual S 174 29.8479 124 -0.01 74
IV.T1299.HNZ. 2020-12-31T00:42:28.38 0.3 undecidable manual S 182 29.3484 125 0.26 71
IT.MTCL.HGZ. 2020-12-31T00:42:27.64 0.3 undecidable manual S 294 26.3514 128 0.16 72
IV.CSP1.EHZ. 2020-12-31T00:42:26.75 0.3 undecidable manual S 341 22.6551 133 0.01 75
IV.FDMO.HHZ. 2020-12-31T00:42:26.59 0.3 undecidable manual S 312 22.8549 133 -0.18 73
IV.MF5.EHZ. 2020-12-31T00:42:25.91 0.3 undecidable manual S 53 16.5723 143 0.27 72
IV.NRCA.HNZ. 2020-12-31T00:42:25.59 0.6 undecidable manual S 244 16.4724 143 -0.03 51
IV.MTRA.EHZ. 2020-12-31T00:42:25.69 0.3 undecidable manual S 153 17.6712 141 -0.14 73
IV.MC2.EHZ. 2020-12-31T00:42:24.83 0.3 undecidable manual S 279 8.7801 158 0.22 74
IV.CESI.HHZ. 2020-12-31T00:42:24.05 3.0 negative manual P 0.08 0
IV.MMO1.EHZ. 2020-12-31T00:42:24.03 0.3 undecidable manual S 88 2.4975 174 -0.17 75
IV.SMA1.EHZ. 2020-12-31T00:42:23.26 0.6 positive manual P 174 29.8479 124 -0.05 49
IV.T1299.HNZ. 2020-12-31T00:42:23.40 0.6 undecidable manual P 182 29.3484 125 0.16 48
IT.MTCL.HGZ. 2020-12-31T00:42:23.01 0.6 undecidable manual P 294 26.3514 128 0.14 48
IV.CSP1.EHZ. 2020-12-31T00:42:22.38 0.3 undecidable manual P 341 22.6551 133 -0.06 75
IV.FDMO.HHZ. 2020-12-31T00:42:22.39 0.6 negative manual P 312 22.8549 133 -0.07 50
IV.NRCA.HNZ. 2020-12-31T00:42:21.41 0.6 undecidable manual P 244 16.4724 143 -0.38 47
IV.MTRA.EHZ. 2020-12-31T00:42:21.83 0.3 positive manual P 153 17.6712 141 -0.09 74
IV.MF5.EHZ. 2020-12-31T00:42:21.87 0.1 negative manual P 53 16.5723 143 0.06 100
IV.MC2.EHZ. 2020-12-31T00:42:21.24 0.6 undecidable manual P 279 8.7801 158 0.03 51
IV.MMO1.EHZ. 2020-12-31T00:42:20.78 0.1 undecidable manual P 88 2.4975 174 -0.2 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1.2 0.000076863155 0.16 AML other m 2020-12-31T00:42:26.22
IV.MTRA.EHN. ML:1.2 0.00006897042500000001 0.12 AML other m 2020-12-31T00:42:25.74
IV.MTRA.HNE. ML:1.2 0.000081972395 0.16 AML other m 2020-12-31T00:42:26.22
IV.MTRA.HNN. ML:1.4 0.00012843655 0.65 AML other m 2020-12-31T00:42:26.21
IV.MF5.EHE. ML:0.8 0.000036018955 0.5 AML other m 2020-12-31T00:42:26.37
IV.MF5.EHN. ML:0.8 0.000033570225 1.02 AML other m 2020-12-31T00:42:25.99
IV.CSP1.EHE. ML:1.5 0.00014328725 0.22 AML other m 2020-12-31T00:42:26.95
IV.CSP1.EHN. ML:1.5 0.00012888404 0.36 AML other m 2020-12-31T00:42:26.87
IV.FDMO.HHE. ML:0.9 0.000035932601499999996 0.18 AML other m 2020-12-31T00:42:26.76
IV.FDMO.HHN. ML:1.0 0.000040304334999999995 0.18 AML other m 2020-12-31T00:42:27.05
IV.SMA1.EHE. ML:0.6 0.000015269005000000003 0.44 AML other m 2020-12-31T00:42:28.99
IV.SMA1.EHN. ML:1.0 0.0000382603345 1.28 AML other m 2020-12-31T00:42:29.03
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