Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 10-01-2021 and time 05:22:03 (UTC) in region 3 km NW Acquasanta Terme (AP)

A magnitude ML 1.7 earthquake occured in region: 3 km NW Acquasanta Terme (AP), on

  • 10-01-2021 05:22:03 (UTC)
  • 10-01-2021 06:22:03 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.79, 13.39 at 22 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
Acquasanta Terme AP 3 2916 2916
Montegallo AP 8 523 3439
Arquata del Tronto AP 8 1178 4617
Valle Castellana TE 11 977 5594
Roccafluvione AP 11 2010 7604
Venarotta AP 13 2066 9670
Montemonaco AP 13 604 10274
Palmiano AP 14 196 10470
Accumoli RI 16 667 11137
Rocca Santa Maria TE 16 537 11674
Ascoli Piceno AP 17 49407 61081
Montefortino FM 18 1178 62259
Comunanza AP 19 3166 65425
Amatrice RI 20 2657 68082

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km W of Teramo (54892 inhabitants)
49 Km N of L'Aquila (69753 inhabitants)
59 Km E of Foligno (57155 inhabitants)
66 Km E of Terni (111501 inhabitants)
69 Km W of Montesilvano (53738 inhabitants)
76 Km W of Pescara (121014 inhabitants)
80 Km NW of Chieti (51815 inhabitants)
89 Km E of Perugia (166134 inhabitants)
93 Km S of Ancona (100861 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 2021-01-10
05:22:03		 42.79 13.39 22 2021-01-10
05:28:41		 Sala Sismica INGV-Roma 86136511
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-10 05:22:03 ± 0.11
Latitude 42.79 ± 0.00
Longitude 13.39 ± 0.01
Depth (km) 22 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86136511

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 401
Semi-minor axis of confidence ellipse (meter) 400
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 66
Circular confidence region, given by single value of horizontal uncertainty (meter) 400
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 81
Number of associated phases, regardless of their use for origin computation 23
Number of defining phases 23
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.16
Epicentral distance of station closest to the epicenter (degree) 0.03327
Epicentral distance of station farthest from the epicenter (degree) 0.33185
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:1.7

Field Value
Value 1.7
Uncertainty 0.2
Num. used stations 12
Type of magnitude ML
Reference to an origin 86136511
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-10 05:28:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-01-10T05:22:16.17 0.3 undecidable manual S 336 0.3318 112 0.05 71
IV.FDMO.HHZ. 2021-01-10T05:22:16.12 0.3 undecidable manual S 318 0.3318 112 -0.02 71
IV.GUMA.HHZ. 2021-01-10T05:22:14.98 0.3 undecidable manual S 352 0.2761 117 0.35 67
IV.TERO.HHZ. 2021-01-10T05:22:13.40 0.3 undecidable manual S 137 0.2284 123 0 73
IV.MF5.EHZ. 2021-01-10T05:22:13.10 0.3 undecidable manual S 14 0.205 127 0.28 69
IV.NRCA.HHZ. 2021-01-10T05:22:13.07 0.3 undecidable manual S 282 0.2077 126 0.18 72
IV.SMA1.EHZ. 2021-01-10T05:22:12.13 0.3 undecidable manual S 194 0.1637 134 0.23 71
IV.MC2.EHZ. 2021-01-10T05:22:12.55 0.3 undecidable manual S 310 0.1916 129 0.03 74
IV.CSP1.EHZ. 2021-01-10T05:22:10.46 0.6 negative manual P 336 0.3318 112 -0.23 46
IV.FDMO.HHZ. 2021-01-10T05:22:10.45 0.3 undecidable manual P 318 0.3318 112 -0.25 68
IV.MNTT.EHZ. 2021-01-10T05:22:10.54 0.6 undecidable manual P 29 0.3112 114 0.17 46
IV.MMO1.EHZ. 2021-01-10T05:22:10.72 0.3 undecidable manual S 337 0.1196 144 -0.31 70
IV.OFFI.HHE. 2021-01-10T05:22:09.47 0.6 undecidable manual P 56 0.2608 119 -0.12 48
IV.MTRA.HNZ. 2021-01-10T05:22:09.85 0.1 undecidable manual S 173 0.0333 169 -0.13 99
IV.GUMA.HHZ. 2021-01-10T05:22:09.82 0.1 positive manual P 352 0.2761 117 -0.01 97
IV.MF5.EHZ. 2021-01-10T05:22:08.75 0.1 negative manual P 14 0.205 127 -0.04 98
IV.NRCA.HHZ. 2021-01-10T05:22:08.78 0.1 positive manual P 282 0.2077 126 -0.05 96
IV.SMA1.EHZ. 2021-01-10T05:22:08.35 0.1 positive manual P 194 0.1637 134 0.1 98
IV.TERO.HHZ. 2021-01-10T05:22:08.89 0.3 undecidable manual P 137 0.2284 123 -0.23 70
IV.MC2.EHZ. 2021-01-10T05:22:08.71 0.6 negative manual P 310 0.1916 129 0.1 48
IV.T1299.HNN. 2021-01-10T05:22:08.59 0.1 undecidable manual P 207 0.1745 132 0.2 95
IV.MTRA.HNZ. 2021-01-10T05:22:07.08 0.1 negative manual P 173 0.0333 169 -0.07 100
IV.MMO1.EHZ. 2021-01-10T05:22:07.55 0.1 undecidable manual P 337 0.1196 144 -0.2 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNE. ML:1.8 0.0005005 1.24 AML other m 2021-01-10T05:22:09.97
IV.MTRA.HNN. ML:1.8 0.000511 0.16 AML other m 2021-01-10T05:22:10.04
IV.MTRA.EHN. ML:1.8 0.0005135 0.16 AML other m 2021-01-10T05:22:10.04
IV.MTRA.EHE. ML:1.8 0.00048 0.18 AML other m 2021-01-10T05:22:10.15
IV.SMA1.EHN. ML:1.2 9.65E-5 0.58 AML other m 2021-01-10T05:22:12.69
IV.NRCA.HHE. ML:1.6 0.0002005 0.18 AML other m 2021-01-10T05:22:13.21
IV.NRCA.HHN. ML:2 0.0004785 0.14 AML other m 2021-01-10T05:22:13.19
IV.NRCA.HNN. ML:1.9 0.0004045 0.14 AML other m 2021-01-10T05:22:13.26
IV.NRCA.HNE. ML:1.7 0.000228 0.7 AML other m 2021-01-10T05:22:13.22
IV.SMA1.EHE. ML:1.2 9.315E-5 1.58 AML other m 2021-01-10T05:22:14.10
IV.GUMA.HHE. ML:1.7 0.0001995 0.24 AML other m 2021-01-10T05:22:15.24
IV.GUMA.HHN. ML:1.5 0.000122 0.76 AML other m 2021-01-10T05:22:15.72
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