M 6.1 - NEAR THE EAST COAST OF HONSHU, JAPAN

Wednesday, May 7, 2008 at 16:16:35 UTC
Location: 36.2°N 141.7°E Depth: 21km
Alert version 3

Summary

Estimated Population Exposed to Earthquake Shaking

Est. Modified Mercalli Intensity	Est. Population Exposure (k = x1000)	Perceived Shaking	Potential Structure Damage
Est. Modified Mercalli Intensity	Est. Population Exposure (k = x1000)	Perceived Shaking	Resistant	Vulnerable
X	0	Extreme	V. Heavy	V. Heavy
IX	0	Violent	Heavy	V. Heavy
VIII	0	Severe	Moderate/Heavy	Heavy
VII	0	Very Strong	Moderate	Moderate/Heavy
VI	0	Strong	Light	Moderate
V	1,401k	Moderate	V. Light	Light
IV	12,317k*	Light	None	None
II-III	--*	Weak	None	None
I	--*	Not Felt	None	None

*Estimated exposure only includes population within the map area.

Population Exposure

Population per ˜1 square km from Landscan 2005

Selected City Exposure

MMI	City	Population
V	Hasaki	39k
V	Oarai	19k
V	Asahi	41k
V	Omigawa	25k
V	Katsuta	155k
V	Itako	25k
IV	Chiba	919k
IV	Funabashi	560k
IV	Matsudo	470k
IV	Ichikawa	458k
IV	Tokyo	8336k

Shaking Intensity

MMI

Users should consider the preliminary nature of this information and check for updates as additional data becomes available. Population exposure estimates are NOT a direct estimate of earthquake damage; comparable shaking will result in significantly lower losses in regions with well built structures than in regions with vulnerable structures. Overall, structures in this region are a mix of vulnerable and resistant construction. A magnitude 6.9 earthquake struck the Kobe, Japan region on January 16, 1995 (UTC), with estimated population exposures of 1.1 million at intensity IX or greater and 2.7 million at intensity VIII, resulting in 6,432 deaths. Recent earthquakes in this area have also triggered landslide and liquefaction hazards that have contributed to losses.

PAGER results are generally available on the Internet within 30 minutes of the earthquake's occurrence. However, information on the extent of shaking will be uncertain in the minutes and hours following an earthquake and typically improves as additional sensor data and reported intensities are acquired and incorporated into models of the earthquake's source. Users of PAGER exposure estimates should account for uncertainty and always seek the most current PAGER release for any earthquake.

Maps

[Population | Shakemap]

Map of MMI contours plotted over population per ˜1 square km (see gray scale bar on top of map). The regions of integer MMI values are separated by the thick contour lines and labeled with Roman numerals. The total population exposure to a given MMI value is obtained by summing the population between the thick contour lines. This total is shown in population exposure table.

Map of shaking intensity. This map shows the estimated MMI as a continuous color scale. The ground shaking estimates can be obtained from http://earthquake.usgs.gov/shakemap/global/shake/2008rtbp.

Exposure

Est. Modified Mercalli Intensity	Est. Population Exposure (k = x1000)	Perceived Shaking	Potential Structure Damage
Est. Modified Mercalli Intensity	Est. Population Exposure (k = x1000)	Perceived Shaking	Resistant	Vulnerable
X	0	Extreme	V. Heavy	V. Heavy
IX	0	Violent	Heavy	V. Heavy
VIII	0	Severe	Moderate/Heavy	Heavy
VII	0	Very Strong	Moderate	Moderate/Heavy
VI	0	Strong	Light	Moderate
V	1,401k	Moderate	V. Light	Light
IV	12,317k*	Light	None	None
II-III	--*	Weak	None	None
I	--*	Not Felt	None	None

*Estimated exposure only includes population within the map area.

Table showing population exposed to different estimated Modified Mercalli Intensity (MMI) levels and the possible damage at different intensity levels for resistant and vulnerable structures. MMI describes the severity of an earthquake in terms of its effect on humans and structures and is a rough measure of the amount of shaking at a given location. Unlike earthquake magnitude, intensity varies with distance from the fault, and is influenced by the depth of the earthquake and the types of soils in the shaken region. Population outside the map bounds are not included in the totals.

Cities

MMI	City	Population
V	Hasaki	39k
V	Oarai	19k
V	Asahi	41k
V	Omigawa	25k
V	Katsuta	155k
V	Itako	25k
V	Sawara	47k
V	Funaishikawa	35k
V	Okunoya	34k
V	Kashima	65k
IV	Takahagi	33k
IV	Yokaichiba	32k
IV	Mito	246k
IV	Chiba	919k
IV	Edosaki	20k
IV	Ishioka	52k
IV	Kitaibaraki	50k
IV	Naruto	25k
IV	Narita	100k
IV	Ami	48k
IV	Hitachi	186k
IV	Ishige	24k
IV	Naka	46k
IV	Yachimata	83k
IV	Shisui	19k
IV	Togane	66k
IV	Sakura	182k
IV	Ryugasaki	85k
IV	Tomobe	37k
IV	Ushiku	80k
IV	Oami	53k
IV	Fujishiro	33k
IV	Omiya	27k
IV	Yotsukaido	86k
IV	Iwaki	357k
IV	Ichihara	283k
IV	Toride	80k
IV	Mashiko	26k
IV	Shiroi	55k
IV	Mobara	97k
IV	Mooka	65k
IV	Motegi	19k
IV	Shimodate	63k
IV	Moriya	56k
IV	Abiko	131k
IV	Mitsukaido	41k
IV	Iwase	21k
IV	Kasama	29k
IV	Namie	21k
IV	Kashiwa	340k
IV	Kisarazu	122k
IV	Katsuura	22k
IV	Narashino	156k
IV	Makabe	19k
IV	Kaminokawa	30k
IV	Otawara	58k
IV	Tsukuba	175k
IV	Yuki	51k
IV	Iwai	42k
IV	Nagareyama	156k
IV	Funabashi	560k
IV	Daigo	22k
IV	Matsudo	470k
IV	Karasuyama	18k
IV	Noda	121k
IV	Utsunomiya	449k
IV	Ichikawa	458k
IV	Futtsu	51k
IV	Sukagawa	68k
IV	Yoshikawa	60k
IV	Oyama	159k
IV	Ishikawa	18k
IV	Sakai	26k
IV	Mibu	39k
IV	Ohara	20k
IV	Kasukabe	206k
IV	Soka	231k
IV	Koshigaya	317k
IV	Urayasu	143k
IV	Hatogaya	53k
IV	Miharu	19k
IV	Ujiie	30k
IV	Kimitsu	92k
IV	Koriyama	340k
IV	Kuroiso	61k
IV	Tateyama	50k
IV	Funehiki	23k
IV	Yaita	36k
IV	Kawaguchi	29k
IV	Motomiya	22k
IV	Nihommatsu	36k
IV	Inawashiro	17k
IV	Tokyo	8336k
IV	Kitakata	37k

Table of MMI estimates and populations for settlements falling within the map boundaries. The settlement name, location, and population are obtained from the freely-available GeoNames geographical database.

Downloads

Details

Magnitude	6.1
Max MMI	V
Date-Time	Wednesday, May 7, 2008 at 16:16:35 UTC
Location	36.166°N, 141.717°E
Depth	21.0 km (13.0 miles)
Event ID	US2008RTBP
Version	3