Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 24-01-2021 and time 02:43:00 (Italy) in region 6 km E Montegallo (AP)

A magnitude ML 1.7 earthquake occured in region: 6 km E Montegallo (AP), on

  • 24-01-2021 01:43:00 (UTC)
  • 24-01-2021 02:43:00 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.84, 13.4 at 23 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
Montegallo AP 6 523 523
Roccafluvione AP 6 2010 2533
Acquasanta Terme AP 8 2916 5449
Palmiano AP 8 196 5645
Venarotta AP 9 2066 7711
Montemonaco AP 9 604 8315
Arquata del Tronto AP 11 1178 9493
Montefortino FM 13 1178 10671
Comunanza AP 13 3166 13837
Valle Castellana TE 14 977 14814
Ascoli Piceno AP 14 49407 64221
Force AP 16 1354 65575
Amandola FM 16 3629 69204
Montefalcone Appennino FM 17 424 69628
Rotella AP 18 906 70534
Folignano AP 19 9241 79775
Smerillo FM 19 365 80140
Rocca Santa Maria TE 20 537 80677

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of Teramo (54892 inhabitants)
54 Km N of L'Aquila (69753 inhabitants)
59 Km E of Foligno (57155 inhabitants)
69 Km E of Terni (111501 inhabitants)
71 Km NW of Montesilvano (53738 inhabitants)
78 Km NW of Pescara (121014 inhabitants)
83 Km NW of Chieti (51815 inhabitants)
87 Km S of Ancona (100861 inhabitants)
88 Km E of Perugia (166134 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 2021-01-24
01:43:00		 42.84 13.4 23 2021-01-24
01:50:58		 Sala Sismica INGV-Roma 86513871
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-24 01:43:00 ± 0.23
Latitude 42.84 ± 0.01
Longitude 13.40 ± 0.01
Depth (km) 23 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86513871

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 937
Semi-minor axis of confidence ellipse (meter) 444
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 272
Circular confidence region, given by single value of horizontal uncertainty (meter) 940
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 179
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 12
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.23
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.35793
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 6
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.6
Num. used stations 8
Type of magnitude ML
Reference to an origin 86513871
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-24 01:50:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IX.CSG3.HNZ.01 2021-01-24T01:44:10.59 3.0 undecidable manual Sg 15 0
IV.MCRV.HHZ. 2021-01-24T01:43:55.05 3.0 undecidable manual Sn 0.3 0
IV.CAFE.HHZ. 2021-01-24T01:43:49.48 3.0 undecidable manual Sn -0.96 0
IV.MTGR.HHZ. 2021-01-24T01:43:49.50 3.0 positive manual Pn -6.7 0
ST.CARE.EHZ. 2021-01-24T01:43:43.53 3.0 positive manual Pn 3.55 0
IV.PTRJ.HNZ. 2021-01-24T01:43:42.66 3.0 undecidable manual Sn 0.78 0
IV.PTRP.HHZ. 2021-01-24T01:43:35.23 3.0 undecidable manual Pg 9.3 0
IV.MTMR.EHZ. 2021-01-24T01:43:30.55 3.0 positive manual Pg 12.32 0
IV.CPGN.EHZ. 2021-01-24T01:43:17.08 3.0 undecidable manual Pg 7.07 0
IV.RM33.EHZ. 2021-01-24T01:43:14.29 0.1 undecidable manual S 203 0.3579 112 0.29 93
IV.PTRJ.HNZ. 2021-01-24T01:43:11.75 3.0 undecidable manual Pn -1.1 0
IV.T1299.EHZ. 2021-01-24T01:43:10.76 0.1 undecidable manual S 204 0.223 126 0.26 95
IV.NRCA.HNN. 2021-01-24T01:43:10.38 0.3 undecidable manual S 269 0.2122 128 0.13 72
IV.SMA1.EHZ. 2021-01-24T01:43:10.05 0.1 undecidable manual S 194 0.214 127 -0.23 94
IV.MF5.EHZ. 2021-01-24T01:43:09.34 0.3 undecidable manual S 15 0.1547 138 0.35 70
IV.RM33.EHZ. 2021-01-24T01:43:08.38 0.1 undecidable manual P 203 0.3579 112 0.16 95
IV.MMO1.EHZ. 2021-01-24T01:43:07.61 0.1 undecidable manual S 317 0.0836 155 -0.2 99
IV.MURB.HHZ. 2021-01-24T01:43:06.45 3.0 positive manual P -1.13 0
IV.T1299.EHZ. 2021-01-24T01:43:06.03 0.1 undecidable manual P 204 0.223 126 -0.16 96
IV.SMA1.EHZ. 2021-01-24T01:43:05.92 0.6 negative manual P 194 0.214 127 -0.15 48
IV.NRCA.HNN. 2021-01-24T01:43:05.95 0.1 undecidable manual P 269 0.2122 128 -0.1 99
IV.MF5.EHZ. 2021-01-24T01:43:05.25 0.1 undecidable manual P 15 0.1547 138 -0.08 100
IV.MMO1.EHZ. 2021-01-24T01:43:04.45 0.1 positive manual P 317 0.0836 155 -0.19 99
IV.MPAG.HNZ. 2021-01-24T01:43:04.83 3.0 positive manual Pn -2.17 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHN. ML:1.4 0.00012625 0.12 AML other m 2021-01-24T01:43:10.38
IV.SMA1.EHE. ML:1.5 0.000138 0.1 AML other m 2021-01-24T01:43:10.48
IV.MPAG.HNN. ML:2.8 0.0006826574 0.2104 AML other m 2021-01-24T01:43:05.69
IV.MPAG.HNE. ML:2.9 0.00080079135 0.2304 AML other m 2021-01-24T01:43:06.14
IV.MPAG.EHE. ML:1.8 5.886777E-5 0.18 AML other m 2021-01-24T01:43:05.68
IV.MPAG.EHN. ML:1.9 7.983729E-5 0.08 AML other m 2021-01-24T01:43:09.53
IV.RM33.EHE. ML:0.7 1.45318575E-5 0.68 AML other m 2021-01-24T01:43:16.29
IV.RM33.EHN. ML:0.7 1.540234E-5 0.3 AML other m 2021-01-24T01:43:14.89
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