Earthquake with magnitude of ML 1.9 on date 31-10-2020 and time 16:31:47 (Italy) in region Tirreno Meridionale (MARE)

A magnitude ML 1.9 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 31-10-2020 15:31:47 (UTC)
  • 31-10-2020 16:31:47 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 38.4, 15.37 at 117 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Villafranca Tirrena ME 19 8584 8584
Spadafora ME 20 5021 13605

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km NW of Messina (238439 inhabitants)
40 Km NW of Reggio di Calabria (183035 inhabitants)
89 Km N of Acireale (52622 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours) *

This map reports the earthquake epicenters located in the 72 hours (3 days) preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days *

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located in the 90 days preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985 *

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2014

Earthquakes since 1000 AD until 2014 *

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
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
Bulletin
Rev1000
ML 1.9 2020-10-31
15:31:47
38.4 15.37 117 2021-02-26
14:56:13
Bollettino Sismico Italiano INGV 86041501
Reviewed
Rev100
ML 2.0 2020-10-31
15:31:47
38.41 15.36 117 2020-10-31
15:45:29
Sala Sismica INGV-Roma 84324711
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-10-31 15:31:47 ± 0.22
Latitude 38.40 ± 0.02
Longitude 15.37 ± 0.02
Depth (km) 117 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86041501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2829
Semi-minor axis of confidence ellipse (meter) 915
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 153
Circular confidence region, given by single value of horizontal uncertainty (meter) 2830
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 132
Number of associated phases, regardless of their use for origin computation 19
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.14124
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 11
Type of magnitude ML
Reference to an origin 86041501
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-06 02:19:40

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 15
Type of magnitude ML
Reference to an origin 84324711
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-10-31 15:45:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
OT.OT05.EHZ. 2020-10-31T15:33:30.71 3.0 undecidable manual Sg 12.36 0
IV.PLAC.HHZ. 2020-10-31T15:32:22.86 0.6 undecidable manual S 86 0.8391 138 0.28 45
MN.CEL.HHZ. 2020-10-31T15:32:17.20 0.6 undecidable manual S 109 0.4353 155 -0.03 51
IV.JOPP.HHZ. 2020-10-31T15:32:17.26 0.6 undecidable manual S 63 0.4533 155 -0.16 50
IV.MPNC.HHZ. 2020-10-31T15:32:16.37 1.0 undecidable manual S 183 0.2545 165 0.6 23
IV.MSRU.HHE. 2020-10-31T15:32:15.48 0.6 undecidable manual S 141 0.1754 170 0.12 53
IV.MILZ.HHE. 2020-10-31T15:32:15.44 0.6 undecidable manual S 220 0.1682 170 0.11 53
XK.SELL.HHZ. 2020-10-31T15:32:10.91 0.1 undecidable manual P 59 1.1412 128 0.29 84
IV.CAR1.HHZ. 2020-10-31T15:32:09.86 0.3 undecidable manual P 37 1.0756 130 -0.06 67
IV.PLAC.HHZ. 2020-10-31T15:32:07.62 0.1 positive manual P 86 0.8391 138 0.05 94
IV.IVPL.HHE. 2020-10-31T15:32:04.00 0.3 undecidable manual P 265 0.3058 162 0.17 77
IV.NOV.HHZ. 2020-10-31T15:32:04.69 0.1 undecidable manual P 206 0.4155 157 0.32 97
MN.CEL.HHZ. 2020-10-31T15:32:04.35 0.3 undecidable manual P 109 0.4353 155 -0.13 76
IV.JOPP.HHZ. 2020-10-31T15:32:04.43 0.1 positive manual P 63 0.4533 155 -0.16 100
IV.AIO.HHZ. 2020-10-31T15:32:04.88 0.6 undecidable manual P 194 0.4425 155 0.36 48
IV.MILZ.HHE. 2020-10-31T15:32:03.18 0.6 undecidable manual P 220 0.1682 170 -0.2 52
IV.SICLA.EHE. 2020-10-31T15:32:03.43 0.3 undecidable manual P 118 0.3076 162 -0.41 73
IV.MPNC.HHZ. 2020-10-31T15:32:03.27 0.1 undecidable manual P 183 0.2545 165 -0.37 99
IV.MSRU.HHE. 2020-10-31T15:32:03.14 0.6 undecidable manual P 141 0.1754 170 -0.26 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.JOPP.HHE. ML:1.6 3.2360755E-5 0.1792 AML other m 2020-10-31T15:32:17.77
IV.JOPP.HHN. ML:1.7 3.4349195E-5 0.2816 AML other m 2020-10-31T15:32:18.66
MN.CEL.HHE. ML:1.6 3.051971E-5 0.3968 AML other m 2020-10-31T15:32:19.04
IV.NOV.HHE. ML:2.2 0.0001209162 0.384 AML other m 2020-10-31T15:32:19.46
MN.CEL.HHN. ML:1.7 3.458386E-5 0.2304 AML other m 2020-10-31T15:32:19.73
IV.NOV.HHN. ML:2.3 0.00014637595 0.4736 AML other m 2020-10-31T15:32:20.27
IV.PLAC.HHE. ML:2 5.1949705E-5 0.4096 AML other m 2020-10-31T15:32:23.78
IV.PLAC.HHN. ML:1.9 4.6968735E-5 0.2944 AML other m 2020-10-31T15:32:23.74
MN.CEL.HNN. ML:1.6 2.3144235E-5 0.3968 AML other m 2020-10-31T15:32:17.85
IV.PLAC.HNN. ML:1.8 3.6904495E-5 0.7552 AML other m 2020-10-31T15:32:23.21
IV.PLAC.HNE. ML:2 5.5813125E-5 0.4992 AML other m 2020-10-31T15:32:23.41
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms *

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download