Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 31-01-2021 and time 09:06:12 (Italy) in region 7 km N Campotosto (AQ)

A magnitude ML 1.1 earthquake occured in region: 7 km N Campotosto (AQ), on

  • 31-01-2021 08:06:12 (UTC)
  • 31-01-2021 09:06:12 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.62, 13.39 at 6 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
Campotosto AQ 7 542 542
Amatrice RI 8 2657 3199
Cortino TE 10 656 3855
Crognaleto TE 11 1297 5152
Capitignano AQ 13 665 5817
Rocca Santa Maria TE 14 537 6354
Fano Adriano TE 14 296 6650
Accumoli RI 14 667 7317
Montereale AQ 16 2581 9898
Valle Castellana TE 16 977 10875
Pietracamela TE 17 271 11146
Acquasanta Terme AP 17 2916 14062
Cittareale RI 19 482 14544
Arquata del Tronto AP 19 1178 15722

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km W of Teramo (54892 inhabitants)
30 Km N of L'Aquila (69753 inhabitants)
61 Km E of Terni (111501 inhabitants)
63 Km W of Montesilvano (53738 inhabitants)
67 Km SE of Foligno (57155 inhabitants)
70 Km W of Pescara (121014 inhabitants)
70 Km W of Chieti (51815 inhabitants)
87 Km NE of Tivoli (56533 inhabitants)
88 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km SE 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 1.1 2021-01-31
08:06:12		 42.62 13.39 6 2021-01-31
08:41:36		 Sala Sismica INGV-Roma 86732541
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-01-31 08:06:12 ± 0.31
Latitude 42.62 ± 0.01
Longitude 13.39 ± 0.01
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 86732541

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 794
Semi-minor axis of confidence ellipse (meter) 629
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 27
Circular confidence region, given by single value of horizontal uncertainty (meter) 790
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 160
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.04227
Epicentral distance of station farthest from the epicenter (degree) 0.21314
Number of stations at which the event was observed 4
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 86732541
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-01-31 08:41:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GIGS.HHZ. 2021-01-31T08:06:21.12 0.3 undecidable manual S 141 0.2131 104 -0.17 72
IV.TERO.HHZ. 2021-01-31T08:06:19.33 0.6 undecidable manual S 88 0.1574 108 0.08 49
IV.GIGS.HHZ. 2021-01-31T08:06:17.53 0.1 undecidable manual P 141 0.2131 104 -0.2 95
IV.TERO.HHZ. 2021-01-31T08:06:16.62 0.3 undecidable manual P 88 0.1574 108 0.07 74
IV.CAMP.HHZ. 2021-01-31T08:06:16.82 0.6 undecidable manual S 170 0.0827 122 0.19 49
IV.SMA1.EHZ. 2021-01-31T08:06:15.11 0.6 undecidable manual S 288 0.0423 141 -0.31 48
IV.CAMP.HHZ. 2021-01-31T08:06:15.21 0.1 undecidable manual P 170 0.0827 122 0.17 98
IV.SMA1.EHZ. 2021-01-31T08:06:14.45 0.1 undecidable manual P 288 0.0423 141 0.11 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SMA1.EHE. ML:0 0.00025 0.26 AML other m 2021-01-31T08:06:15.60
IV.SMA1.EHN. ML:0 0.0001665 0.88 AML other m 2021-01-31T08:06:15.56
IV.TERO.HHN. ML:1.1 0.000124 0.18 AML other m 2021-01-31T08:06:19.52
IV.TERO.HHE. ML:1 0.000104 0.08 AML other m 2021-01-31T08:06:19.60
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