Earthquake with magnitude of ML 1.8 on date 31-10-2021 and time 21:48:31 (Italy) in region Tirreno Meridionale (MARE)

A magnitude ML 1.8 earthquake occured in region: Tirreno Meridionale (MARE), on

  • 31-10-2021 20:48:31 (UTC)
  • 31-10-2021 21:48:31 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 39.361, 15.279 at 271 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.

Municipalities within 20 km from the epicenter

No Italian municipalities within 20 km distance.

Municipalities with at least 50000 inhabitants

An earthquake occurred to
84 Km W of Cosenza (67546 inhabitants)
99 Km W of Lamezia Terme (70714 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of earthquake resentment in the area, expressed in terms of intensity on the MCS scale (Mercalli-Cancani-Sieberg). Intensities are determined using data from questionnaires collected on the website http://www.hsit.it. The intensities shown are determined considering all the reports received from each municipality, and are all the more reliable the greater the number of questionnaires. The collected data are subjected to an automatic statistical filter, but are not checked individually. In particular, intensities greater than or equal to the VI degree of the MCS or EMS scale require on-site verification by specialized personnel. The black star is the epicenter of the earthquake that occurred. This map is updated every time citizens fill out new questionnaires. The number of questionnaires processed to obtain this map, the date and time of the last update are shown at the top right.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.8 2021-10-31
20:48:31
39.3607 15.2792 271 2021-10-31
20:58:07
Sala Sismica INGV-Roma 97118101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-31 20:48:31 ± 0.49
Latitude 39.3607 ± 0.0396
Longitude 15.2792 ± 0.0721
Depth (km) 271 ± 4 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 97118101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 5956
Semi-minor axis of confidence ellipse (meter) 4365
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 96
Circular confidence region, given by single value of horizontal uncertainty (meter) 5960
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 193
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.54769
Epicentral distance of station farthest from the epicenter (degree) 1.38945
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 97118101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-31 20:58:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PLAC.HHE. 2021-10-31T20:49:39.41 0.6 undecidable manual S 135 1.2815 151 -0.58 40
MN.TIP.HHZ. 2021-10-31T20:49:38.82 0.6 undecidable manual S 99 1.1583 154 0.2 46
IV.SERS.HHZ. 2021-10-31T20:49:38.84 0.6 undecidable manual S 106 1.1385 154 0.43 44
IV.CELI.HHZ. 2021-10-31T20:49:37.70 0.6 undecidable manual S 87 0.9506 158 1.12 35
IV.JOPP.HHE. 2021-10-31T20:49:35.97 0.6 undecidable manual S 148 0.8885 159 -0.07 50
IV.CAR1.HHZ. 2021-10-31T20:49:34.23 0.6 undecidable manual S 98 0.7285 163 -0.56 46
IV.AIO.HHZ. 2021-10-31T20:49:13.45 0.3 undecidable manual P 182 1.3895 149 1.85 29
IV.ORI.HHE. 2021-10-31T20:49:10.28 0.3 undecidable manual P 52 1.134 154 0.35 67
IV.PLAC.HHE. 2021-10-31T20:49:10.64 0.1 undecidable manual P 135 1.2815 151 -0.23 89
IV.LADO.EHE. 2021-10-31T20:49:10.85 0.3 undecidable manual P 93 1.3166 151 -0.25 65
IV.PIPA.HHE. 2021-10-31T20:49:10.13 0.3 undecidable manual P 84 1.1925 153 -0.16 69
IV.SERS.HHZ. 2021-10-31T20:49:09.92 0.1 negative manual P 106 1.1385 154 -0.04 95
IV.TDS.HHE. 2021-10-31T20:49:09.26 0.1 undecidable manual P 70 0.8687 160 0.76 83
MN.TIP.HHZ. 2021-10-31T20:49:09.86 0.1 undecidable manual P 99 1.1583 154 -0.22 91
IV.SELL.HHE. 2021-10-31T20:49:09.81 0.3 undecidable manual P 109 1.1107 155 0.02 72
IV.CELI.HHZ. 2021-10-31T20:49:09.33 0.1 undecidable manual P 87 0.9506 158 0.42 92
IV.GRI.EHE. 2021-10-31T20:49:09.47 0.3 undecidable manual P 121 1.036 156 0.11 72
IV.JOPP.HHE. 2021-10-31T20:49:08.49 0.1 undecidable manual P 148 0.8885 159 -0.1 100
IV.CAR1.HHZ. 2021-10-31T20:49:07.26 0.3 undecidable manual P 98 0.7285 163 -0.61 68
IV.MGR.HHE. 2021-10-31T20:49:07.96 0.3 undecidable manual P 15 0.8049 161 -0.23 74
IV.GRIS.EHE. 2021-10-31T20:49:06.93 0.3 undecidable manual P 49 0.5828 166 -0.4 75
IV.CET2.HHZ. 2021-10-31T20:49:06.76 0.3 undecidable manual P 72 0.5477 167 -0.46 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CELI.HHN. ML:1.6 5.2968127E-6 0.2176 AML other m 2021-10-31T20:49:09.93
MN.TIP.HHE. ML:1.6 4.1879635E-6 0.1152 AML other m 2021-10-31T20:49:10.57
MN.TIP.HHN. ML:1.9 8.16783E-6 0.3328 AML other m 2021-10-31T20:49:10.27
IV.SERS.HHE. ML:1.9 8.7272455E-6 0.2176 AML other m 2021-10-31T20:49:09.99
IV.SERS.HHN. ML:2.1 1.68762825E-5 0.2432 AML other m 2021-10-31T20:49:10.22
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